<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:3c33a1e8-7199-47de-acf0-8b7e7899ecda,g:5d0245b2-6c7e-4bad-b13c-0d7c3a28c8af-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.firstwatch.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="fwrg-20240929.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONSANDCOMPREHENSIVEINCOMELOSS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_ea30208c-bbda-4e54-8876-14abfa5e2bf9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_StatementTable_ea30208c-bbda-4e54-8876-14abfa5e2bf9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_7e55c3db-84c3-4fbf-be7f-377a52734cbd" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_ea30208c-bbda-4e54-8876-14abfa5e2bf9" xlink:to="loc_srt_ProductOrServiceAxis_7e55c3db-84c3-4fbf-be7f-377a52734cbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7e55c3db-84c3-4fbf-be7f-377a52734cbd_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_7e55c3db-84c3-4fbf-be7f-377a52734cbd" xlink:to="loc_srt_ProductsAndServicesDomain_7e55c3db-84c3-4fbf-be7f-377a52734cbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3a236018-db8a-4e7a-9ace-632e16b1b2bb" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_7e55c3db-84c3-4fbf-be7f-377a52734cbd" xlink:to="loc_srt_ProductsAndServicesDomain_3a236018-db8a-4e7a-9ace-632e16b1b2bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorOwnedOutletMember_f8789685-ffb7-4f6e-b423-10b0d5ec446d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisorOwnedOutletMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3a236018-db8a-4e7a-9ace-632e16b1b2bb" xlink:to="loc_us-gaap_FranchisorOwnedOutletMember_f8789685-ffb7-4f6e-b423-10b0d5ec446d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchiseMember_d30d0a79-3579-4cef-a8f5-d4ae1fcf1e7e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3a236018-db8a-4e7a-9ace-632e16b1b2bb" xlink:to="loc_us-gaap_FranchiseMember_d30d0a79-3579-4cef-a8f5-d4ae1fcf1e7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_f2c8ccb9-7eb2-4b4a-8f76-2cd1c1a845fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_RevenuesAbstract_f2c8ccb9-7eb2-4b4a-8f76-2cd1c1a845fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d20f5057-ee90-4b8a-a330-eda7497a260e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_f2c8ccb9-7eb2-4b4a-8f76-2cd1c1a845fe" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_d20f5057-ee90-4b8a-a330-eda7497a260e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostDirectMaterial_5fc1cf5b-1014-497b-94b0-8466e7d1026b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostDirectMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:to="loc_us-gaap_CostDirectMaterial_5fc1cf5b-1014-497b-94b0-8466e7d1026b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostDirectLabor_64df1603-94c7-4bee-9e4f-f7ec2e479091" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostDirectLabor"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:to="loc_us-gaap_CostDirectLabor_64df1603-94c7-4bee-9e4f-f7ec2e479091" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostOfOperatingRevenue_22510632-2607-4e2b-9e31-911777e461e2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherCostOfOperatingRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:to="loc_us-gaap_OtherCostOfOperatingRevenue_22510632-2607-4e2b-9e31-911777e461e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSoldOverhead_6ead0cbe-1c0d-4855-bfd1-52f120954190" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostOfGoodsAndServicesSoldOverhead"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSoldOverhead_6ead0cbe-1c0d-4855-bfd1-52f120954190" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreOpeningCosts_de0edcee-25e8-4ca1-b5e8-8bd45cfd001d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PreOpeningCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortizationAbstract_e987bc50-9288-4802-b96c-96f8f6faff4a" xlink:to="loc_us-gaap_PreOpeningCosts_de0edcee-25e8-4ca1-b5e8-8bd45cfd001d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_51e47f90-8b07-46cd-90ad-2cc0523fd52f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_51e47f90-8b07-46cd-90ad-2cc0523fd52f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_4d38c9a6-d2e6-463b-be50-fc3a56d24807" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:to="loc_us-gaap_DepreciationAndAmortization_4d38c9a6-d2e6-463b-be50-fc3a56d24807" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_3020ff2c-ff4a-493e-8780-807461e3c9c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_3020ff2c-ff4a-493e-8780-807461e3c9c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_TransactionIncomeExpenseNet_fcf7a105-4ef7-45c0-8cb0-22251fa47d1f" xlink:href="fwrg-20240929.xsd#fwrg_TransactionIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:to="loc_fwrg_TransactionIncomeExpenseNet_fcf7a105-4ef7-45c0-8cb0-22251fa47d1f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_6b0511e1-fce5-42b6-a4cf-1e49fa2849d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f477924e-6dc6-41dc-9940-b34fb1c02e1b" xlink:to="loc_us-gaap_CostsAndExpenses_6b0511e1-fce5-42b6-a4cf-1e49fa2849d7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_e55c8748-da37-4909-929e-dc5fdf46cbfa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_OperatingIncomeLoss_e55c8748-da37-4909-929e-dc5fdf46cbfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_b2b6725c-73d1-4486-b377-8f29b0398b5d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_InterestExpenseNonoperating_b2b6725c-73d1-4486-b377-8f29b0398b5d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_8e4442b2-a261-45d7-8437-0e96a5f420c5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_8e4442b2-a261-45d7-8437-0e96a5f420c5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4b4a7a9d-c948-4cb9-b9fd-6007a9fdaf5f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_4b4a7a9d-c948-4cb9-b9fd-6007a9fdaf5f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_e4fee862-5285-42fd-98d6-919b85b629e1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_e4fee862-5285-42fd-98d6-919b85b629e1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_9dd15b69-ff71-49f1-8ae0-25a006d23866" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_NetIncomeLoss_9dd15b69-ff71-49f1-8ae0-25a006d23866" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_5ae28611-f14d-4927-bdfa-f16b3b4b2acd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_d3e34744-9fae-4fd7-b1f1-68a375fef2e9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_d3e34744-9fae-4fd7-b1f1-68a375fef2e9" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_3992f159-fc3c-43bf-b725-50919b44a6c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_d3e34744-9fae-4fd7-b1f1-68a375fef2e9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent_3992f159-fc3c-43bf-b725-50919b44a6c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_86c9b9ac-2fcf-4715-94ae-89c629b60d8a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParentAbstract_d3e34744-9fae-4fd7-b1f1-68a375fef2e9" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_86c9b9ac-2fcf-4715-94ae-89c629b60d8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_45f09cb1-a699-4880-b789-4670c287a73f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_45f09cb1-a699-4880-b789-4670c287a73f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_40b22033-4d93-4521-9db1-70bb7919a31f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_EarningsPerShareBasic_40b22033-4d93-4521-9db1-70bb7919a31f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_9d8069cf-b196-4a48-b9c9-2163157f63c0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_EarningsPerShareDiluted_9d8069cf-b196-4a48-b9c9-2163157f63c0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_512bcfae-5156-4960-95b8-188ebd340b03" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_512bcfae-5156-4960-95b8-188ebd340b03" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_21dce7d4-4b98-49f4-86b3-0c41fdba9c55" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_840aae7c-4af7-45a5-b823-a7158842dcef" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_21dce7d4-4b98-49f4-86b3-0c41fdba9c55" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="fwrg-20240929.xsd#CONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/CONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_55c69f35-3d71-4342-a7b5-c4f947aff98f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_4c10e684-2dd6-4b47-b7b4-bf3d3dc9e9bb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_55c69f35-3d71-4342-a7b5-c4f947aff98f" xlink:to="loc_us-gaap_StatementTable_4c10e684-2dd6-4b47-b7b4-bf3d3dc9e9bb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_95173788-9e18-41e5-a670-6316cc199b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4c10e684-2dd6-4b47-b7b4-bf3d3dc9e9bb" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_95173788-9e18-41e5-a670-6316cc199b8d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_95173788-9e18-41e5-a670-6316cc199b8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_95173788-9e18-41e5-a670-6316cc199b8d" xlink:to="loc_us-gaap_EquityComponentDomain_95173788-9e18-41e5-a670-6316cc199b8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_dbf7a5af-bce5-4af2-bf1c-d27dd6bad47e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_95173788-9e18-41e5-a670-6316cc199b8d" xlink:to="loc_us-gaap_EquityComponentDomain_dbf7a5af-bce5-4af2-bf1c-d27dd6bad47e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_a507ef76-f12b-4f96-bef3-0a85d41aec89" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_dbf7a5af-bce5-4af2-bf1c-d27dd6bad47e" xlink:to="loc_us-gaap_CommonStockMember_a507ef76-f12b-4f96-bef3-0a85d41aec89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_55993e58-8e43-4a01-a9a6-f878702caf03" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_dbf7a5af-bce5-4af2-bf1c-d27dd6bad47e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_55993e58-8e43-4a01-a9a6-f878702caf03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_4006969e-0aa8-481a-b824-0227eabbdb32" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_dbf7a5af-bce5-4af2-bf1c-d27dd6bad47e" xlink:to="loc_us-gaap_RetainedEarningsMember_4006969e-0aa8-481a-b824-0227eabbdb32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f0efa66c-7783-459e-84c0-1ae7222af8d7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_dbf7a5af-bce5-4af2-bf1c-d27dd6bad47e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f0efa66c-7783-459e-84c0-1ae7222af8d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_55c69f35-3d71-4342-a7b5-c4f947aff98f" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_50b29a10-3419-4d09-9f18-f9d717640930" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_50b29a10-3419-4d09-9f18-f9d717640930" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_3198e841-e95f-4df2-8525-964bb6697978" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_StockholdersEquity_3198e841-e95f-4df2-8525-964bb6697978" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_3ef3db5d-a1a9-4f18-b08e-3accac04556f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_NetIncomeLoss_3ef3db5d-a1a9-4f18-b08e-3accac04556f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_4a484cd2-7809-4262-8f15-9de75814c686" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_4a484cd2-7809-4262-8f15-9de75814c686" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_e6b23883-dbc8-45a8-9cd7-962da8ae7894" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_e6b23883-dbc8-45a8-9cd7-962da8ae7894" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_4972d137-342a-4ca0-80f0-0bde427fb813" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_4972d137-342a-4ca0-80f0-0bde427fb813" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_9a35108f-ec41-4a09-b371-375dd06e33cc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_86f84432-3856-4511-91cb-c00dd4d6ce19" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_9a35108f-ec41-4a09-b371-375dd06e33cc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_4e3afd0d-1c7d-426c-9a65-368a67832e0f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_753b0cc2-f734-4a04-ae3c-956ae18d8735" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="simple" xlink:href="fwrg-20240929.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_aa3d87c5-4eed-4c1b-a06f-da2290063e72" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_2b1648dd-0fbb-4ac2-bdaa-003d410ac87e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_aa3d87c5-4eed-4c1b-a06f-da2290063e72" xlink:to="loc_us-gaap_StatementTable_2b1648dd-0fbb-4ac2-bdaa-003d410ac87e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_56fefde2-c1fc-4482-b204-0b0f1288543d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_2b1648dd-0fbb-4ac2-bdaa-003d410ac87e" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_56fefde2-c1fc-4482-b204-0b0f1288543d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56fefde2-c1fc-4482-b204-0b0f1288543d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_56fefde2-c1fc-4482-b204-0b0f1288543d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_56fefde2-c1fc-4482-b204-0b0f1288543d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e50c4e42-3ab6-4228-aece-48ab2704500d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_56fefde2-c1fc-4482-b204-0b0f1288543d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e50c4e42-3ab6-4228-aece-48ab2704500d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_14e490b0-efd6-42c4-b738-b7580009eaff" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e50c4e42-3ab6-4228-aece-48ab2704500d" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_14e490b0-efd6-42c4-b738-b7580009eaff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_86df2057-2390-49e8-b132-6ccaead5fbd3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_aa3d87c5-4eed-4c1b-a06f-da2290063e72" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_86df2057-2390-49e8-b132-6ccaead5fbd3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/NatureofBusinessandOrganizationAdditionalInformationDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#NatureofBusinessandOrganizationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/NatureofBusinessandOrganizationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureLineItems_193e280d-d5c3-4bea-81d0-501d64fabc91" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisorDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_f33896e7-0c8d-4654-abdf-8457f35d0fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfFranchisorDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_193e280d-d5c3-4bea-81d0-501d64fabc91" xlink:to="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_f33896e7-0c8d-4654-abdf-8457f35d0fb4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureAxis_29741ab0-ae5e-4540-ae00-86c1b7e2cfaf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisorDisclosureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFranchisorDisclosureTable_f33896e7-0c8d-4654-abdf-8457f35d0fb4" xlink:to="loc_us-gaap_FranchisorDisclosureAxis_29741ab0-ae5e-4540-ae00-86c1b7e2cfaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureDomain_29741ab0-ae5e-4540-ae00-86c1b7e2cfaf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisorDisclosureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FranchisorDisclosureAxis_29741ab0-ae5e-4540-ae00-86c1b7e2cfaf" xlink:to="loc_us-gaap_FranchisorDisclosureDomain_29741ab0-ae5e-4540-ae00-86c1b7e2cfaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorDisclosureDomain_9fa3aa89-dd6c-4ad4-9f01-f9719d1b3e4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisorDisclosureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FranchisorDisclosureAxis_29741ab0-ae5e-4540-ae00-86c1b7e2cfaf" xlink:to="loc_us-gaap_FranchisorDisclosureDomain_9fa3aa89-dd6c-4ad4-9f01-f9719d1b3e4a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityOperatedUnitsMember_e655d69b-ac24-42a7-b11f-c8a285ed7836" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EntityOperatedUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureDomain_9fa3aa89-dd6c-4ad4-9f01-f9719d1b3e4a" xlink:to="loc_us-gaap_EntityOperatedUnitsMember_e655d69b-ac24-42a7-b11f-c8a285ed7836" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisedUnitsMember_b28d3552-b743-4938-a1b9-20e8163b2e99" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisedUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureDomain_9fa3aa89-dd6c-4ad4-9f01-f9719d1b3e4a" xlink:to="loc_us-gaap_FranchisedUnitsMember_b28d3552-b743-4938-a1b9-20e8163b2e99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfStatesInWhichEntityOperates_366a713d-117d-4d84-b3e7-d7dfa1724dec" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfStatesInWhichEntityOperates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_193e280d-d5c3-4bea-81d0-501d64fabc91" xlink:to="loc_us-gaap_NumberOfStatesInWhichEntityOperates_366a713d-117d-4d84-b3e7-d7dfa1724dec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfRestaurants_0c5df713-1bab-4216-8475-8b8f1e8c0c7c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfRestaurants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorDisclosureLineItems_193e280d-d5c3-4bea-81d0-501d64fabc91" xlink:to="loc_us-gaap_NumberOfRestaurants_0c5df713-1bab-4216-8475-8b8f1e8c0c7c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/BusinessAcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#BusinessAcquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/BusinessAcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_21384c4e-2496-4982-86ff-55d931aa2c1e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_54a0c483-1702-498e-bf7c-9c78037ac388" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_21384c4e-2496-4982-86ff-55d931aa2c1e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_54a0c483-1702-498e-bf7c-9c78037ac388" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_a9407e08-0221-4e16-bb91-921cec6a0b17" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_54a0c483-1702-498e-bf7c-9c78037ac388" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_a9407e08-0221-4e16-bb91-921cec6a0b17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a9407e08-0221-4e16-bb91-921cec6a0b17_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a9407e08-0221-4e16-bb91-921cec6a0b17" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a9407e08-0221-4e16-bb91-921cec6a0b17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fa1f1f30-b111-4aa3-a7ff-b347325de934" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a9407e08-0221-4e16-bb91-921cec6a0b17" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fa1f1f30-b111-4aa3-a7ff-b347325de934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_28059267-fef3-4385-9c45-2d7b0f9f19bf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fa1f1f30-b111-4aa3-a7ff-b347325de934" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_28059267-fef3-4385-9c45-2d7b0f9f19bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NumberOfBusinessAcquisitionTransactions_b6c5a7e6-a817-4397-8beb-14a6edd04b08" xlink:href="fwrg-20240929.xsd#fwrg_NumberOfBusinessAcquisitionTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_21384c4e-2496-4982-86ff-55d931aa2c1e" xlink:to="loc_fwrg_NumberOfBusinessAcquisitionTransactions_b6c5a7e6-a817-4397-8beb-14a6edd04b08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_8a963403-c3c4-4dc8-8e68-3c03621c0b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_21384c4e-2496-4982-86ff-55d931aa2c1e" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_8a963403-c3c4-4dc8-8e68-3c03621c0b6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_982c44fe-65b0-479f-b885-9611d0609942" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_21384c4e-2496-4982-86ff-55d931aa2c1e" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_982c44fe-65b0-479f-b885-9611d0609942" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_a9c466d6-126d-4266-9977-0454bcb16ab5" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_21384c4e-2496-4982-86ff-55d931aa2c1e" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_a9c466d6-126d-4266-9977-0454bcb16ab5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/BusinessAcquisitionsScheduleofBusinessAcquisitionsbyAcquisitionDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#BusinessAcquisitionsScheduleofBusinessAcquisitionsbyAcquisitionDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/BusinessAcquisitionsScheduleofBusinessAcquisitionsbyAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_087cc0e5-1f65-4944-a2eb-7392cc75fd71" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bc351a0b-de96-403f-b5b4-afbb2d42168c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_087cc0e5-1f65-4944-a2eb-7392cc75fd71" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bc351a0b-de96-403f-b5b4-afbb2d42168c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5c95ff5a-10a3-4da8-bf13-62f3bece18fa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_bc351a0b-de96-403f-b5b4-afbb2d42168c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5c95ff5a-10a3-4da8-bf13-62f3bece18fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5c95ff5a-10a3-4da8-bf13-62f3bece18fa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5c95ff5a-10a3-4da8-bf13-62f3bece18fa" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5c95ff5a-10a3-4da8-bf13-62f3bece18fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_180ac103-e1d6-4bfc-85c4-f7f97966c467" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5c95ff5a-10a3-4da8-bf13-62f3bece18fa" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_180ac103-e1d6-4bfc-85c4-f7f97966c467" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_a0ec9806-9fd6-4755-b29e-8b4bb13deec4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_180ac103-e1d6-4bfc-85c4-f7f97966c467" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_a0ec9806-9fd6-4755-b29e-8b4bb13deec4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_85ac6adb-36ad-42b9-a9ab-a75273f0b5c7" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_087cc0e5-1f65-4944-a2eb-7392cc75fd71" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_85ac6adb-36ad-42b9-a9ab-a75273f0b5c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_6329edbe-1c73-48f7-bf15-d19048d3e8e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_087cc0e5-1f65-4944-a2eb-7392cc75fd71" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_6329edbe-1c73-48f7-bf15-d19048d3e8e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_087cc0e5-1f65-4944-a2eb-7392cc75fd71" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b2b7a7fa-4d25-40fd-8f69-deab9b4dd0ed" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_b2b7a7fa-4d25-40fd-8f69-deab9b4dd0ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_e8b9c94d-f4ca-4712-bdda-079b95df4ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory_e8b9c94d-f4ca-4712-bdda-079b95df4ceb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_adfaca9a-bc37-4200-817b-75953221eb03" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_adfaca9a-bc37-4200-817b-75953221eb03" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_266a897a-9bce-4c08-a596-fc5b0f6f4998" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_266a897a-9bce-4c08-a596-fc5b0f6f4998" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_6fcf1282-c453-4faa-a896-ca625a6a15c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_6fcf1282-c453-4faa-a896-ca625a6a15c2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingRightOfUseAssetNetOfLeasePositionAndPrepaidRent_94612016-85a9-4423-9c86-a6237d5b05d1" xlink:href="fwrg-20240929.xsd#fwrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingRightOfUseAssetNetOfLeasePositionAndPrepaidRent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_fwrg_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOperatingRightOfUseAssetNetOfLeasePositionAndPrepaidRent_94612016-85a9-4423-9c86-a6237d5b05d1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_ea459555-94bc-434b-bcbe-c7ae6449ab5a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue_ea459555-94bc-434b-bcbe-c7ae6449ab5a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_9e500473-01a2-49a9-819a-17f3f150d84e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation_9e500473-01a2-49a9-819a-17f3f150d84e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_7b7c6ff0-642f-4909-b22d-22062881ea44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_d82b6499-3acc-42a3-b8f0-a1616bfcd90a" xlink:to="loc_us-gaap_Goodwill_7b7c6ff0-642f-4909-b22d-22062881ea44" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/RevenuesDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#RevenuesDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/RevenuesDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_5fdb52b1-2ea2-4a1c-af12-0b8db35d159a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_df53d0a8-3651-4d0b-8f2c-97dd7e448c41" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5fdb52b1-2ea2-4a1c-af12-0b8db35d159a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_df53d0a8-3651-4d0b-8f2c-97dd7e448c41" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_1fbd0566-d36c-4dc0-9956-38cc17a7037b" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_df53d0a8-3651-4d0b-8f2c-97dd7e448c41" xlink:to="loc_srt_ProductOrServiceAxis_1fbd0566-d36c-4dc0-9956-38cc17a7037b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1fbd0566-d36c-4dc0-9956-38cc17a7037b_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_1fbd0566-d36c-4dc0-9956-38cc17a7037b" xlink:to="loc_srt_ProductsAndServicesDomain_1fbd0566-d36c-4dc0-9956-38cc17a7037b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_3c14ed6c-64ff-46cd-b22c-58281b72b4bd" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_1fbd0566-d36c-4dc0-9956-38cc17a7037b" xlink:to="loc_srt_ProductsAndServicesDomain_3c14ed6c-64ff-46cd-b22c-58281b72b4bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchisorOwnedOutletMember_cd5b519e-7a4f-46c4-8751-4160c70b714c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchisorOwnedOutletMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3c14ed6c-64ff-46cd-b22c-58281b72b4bd" xlink:to="loc_us-gaap_FranchisorOwnedOutletMember_cd5b519e-7a4f-46c4-8751-4160c70b714c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_InRestaurantDiningSalesMember_fb2bf8bb-fca2-4cf1-b3fa-bb0ad304844e" xlink:href="fwrg-20240929.xsd#fwrg_InRestaurantDiningSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorOwnedOutletMember_cd5b519e-7a4f-46c4-8751-4160c70b714c" xlink:to="loc_fwrg_InRestaurantDiningSalesMember_fb2bf8bb-fca2-4cf1-b3fa-bb0ad304844e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_ThirdPartyDeliverySalesMember_baf4d1ad-5043-4c0b-b093-64b40bccc456" xlink:href="fwrg-20240929.xsd#fwrg_ThirdPartyDeliverySalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorOwnedOutletMember_cd5b519e-7a4f-46c4-8751-4160c70b714c" xlink:to="loc_fwrg_ThirdPartyDeliverySalesMember_baf4d1ad-5043-4c0b-b093-64b40bccc456" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_TakeOutSalesMember_f0bfd028-857d-49ee-bbd5-942197a5fe8d" xlink:href="fwrg-20240929.xsd#fwrg_TakeOutSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchisorOwnedOutletMember_cd5b519e-7a4f-46c4-8751-4160c70b714c" xlink:to="loc_fwrg_TakeOutSalesMember_f0bfd028-857d-49ee-bbd5-942197a5fe8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FranchiseMember_4bca635d-01ea-4a1b-83b0-c3f0899b939a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FranchiseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_3c14ed6c-64ff-46cd-b22c-58281b72b4bd" xlink:to="loc_us-gaap_FranchiseMember_4bca635d-01ea-4a1b-83b0-c3f0899b939a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_RoyaltyAndSystemFundContributionsMember_810fc823-3ae3-4cf7-9f3f-83c049025154" xlink:href="fwrg-20240929.xsd#fwrg_RoyaltyAndSystemFundContributionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchiseMember_4bca635d-01ea-4a1b-83b0-c3f0899b939a" xlink:to="loc_fwrg_RoyaltyAndSystemFundContributionsMember_810fc823-3ae3-4cf7-9f3f-83c049025154" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_InitialFeesMember_4c1e9821-b35c-4855-9bc8-bd032f53756d" xlink:href="fwrg-20240929.xsd#fwrg_InitialFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchiseMember_4bca635d-01ea-4a1b-83b0-c3f0899b939a" xlink:to="loc_fwrg_InitialFeesMember_4c1e9821-b35c-4855-9bc8-bd032f53756d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_BusinessCombinationsRevenuesRecognizedMember_275fc032-1b21-4d4e-994e-d6e80d1767df" xlink:href="fwrg-20240929.xsd#fwrg_BusinessCombinationsRevenuesRecognizedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FranchiseMember_4bca635d-01ea-4a1b-83b0-c3f0899b939a" xlink:to="loc_fwrg_BusinessCombinationsRevenuesRecognizedMember_275fc032-1b21-4d4e-994e-d6e80d1767df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_372adfc8-7248-4e37-a47b-403535f29bd1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_5fdb52b1-2ea2-4a1c-af12-0b8db35d159a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_372adfc8-7248-4e37-a47b-403535f29bd1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/DebtLongTermDebtNetDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#DebtLongTermDebtNetDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/DebtLongTermDebtNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_63e11f9d-3d06-465d-8f86-f43ab9a3b926" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_DebtInstrumentTable_63e11f9d-3d06-465d-8f86-f43ab9a3b926" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_26854fb7-c608-4746-a864-dafa8966fa6b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_63e11f9d-3d06-465d-8f86-f43ab9a3b926" xlink:to="loc_us-gaap_CreditFacilityAxis_26854fb7-c608-4746-a864-dafa8966fa6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_26854fb7-c608-4746-a864-dafa8966fa6b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_26854fb7-c608-4746-a864-dafa8966fa6b" xlink:to="loc_us-gaap_CreditFacilityDomain_26854fb7-c608-4746-a864-dafa8966fa6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_548650ed-3926-4ac1-99e4-e5e29ebc10d3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_26854fb7-c608-4746-a864-dafa8966fa6b" xlink:to="loc_us-gaap_CreditFacilityDomain_548650ed-3926-4ac1-99e4-e5e29ebc10d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_TermFacilityMember_94c68340-2d7d-4bf6-b617-cbd16544cc79" xlink:href="fwrg-20240929.xsd#fwrg_TermFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_548650ed-3926-4ac1-99e4-e5e29ebc10d3" xlink:to="loc_fwrg_TermFacilityMember_94c68340-2d7d-4bf6-b617-cbd16544cc79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DelayedDrawTermLoanMember_44e5ccd3-b0f0-49ec-80fe-899b6edf1750" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DelayedDrawTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_548650ed-3926-4ac1-99e4-e5e29ebc10d3" xlink:to="loc_us-gaap_DelayedDrawTermLoanMember_44e5ccd3-b0f0-49ec-80fe-899b6edf1750" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_1ebc2408-a0c1-42f0-a817-90e9ee7afe6f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_548650ed-3926-4ac1-99e4-e5e29ebc10d3" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_1ebc2408-a0c1-42f0-a817-90e9ee7afe6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_973fe953-356d-4e23-91de-7acdabc33a2f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_63e11f9d-3d06-465d-8f86-f43ab9a3b926" xlink:to="loc_us-gaap_DebtInstrumentAxis_973fe953-356d-4e23-91de-7acdabc33a2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_973fe953-356d-4e23-91de-7acdabc33a2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_973fe953-356d-4e23-91de-7acdabc33a2f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_973fe953-356d-4e23-91de-7acdabc33a2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_44f2dd5c-bec5-4744-8726-fd0e8842624c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_973fe953-356d-4e23-91de-7acdabc33a2f" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_44f2dd5c-bec5-4744-8726-fd0e8842624c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NewFacilitiesMember_0e91ebd2-79bd-4d9b-bf3c-6af9c77608a7" xlink:href="fwrg-20240929.xsd#fwrg_NewFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_44f2dd5c-bec5-4744-8726-fd0e8842624c" xlink:to="loc_fwrg_NewFacilitiesMember_0e91ebd2-79bd-4d9b-bf3c-6af9c77608a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_FinancingObligationsMember_6f3884f1-eff8-4603-8964-49ab41933b24" xlink:href="fwrg-20240929.xsd#fwrg_FinancingObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_44f2dd5c-bec5-4744-8726-fd0e8842624c" xlink:to="loc_fwrg_FinancingObligationsMember_6f3884f1-eff8-4603-8964-49ab41933b24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_95de3733-d57e-40d5-ac0b-4310a270114b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_63e11f9d-3d06-465d-8f86-f43ab9a3b926" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_95de3733-d57e-40d5-ac0b-4310a270114b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_95de3733-d57e-40d5-ac0b-4310a270114b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_95de3733-d57e-40d5-ac0b-4310a270114b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_95de3733-d57e-40d5-ac0b-4310a270114b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b9ed5d84-a266-4df5-8f28-f764868a810d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_95de3733-d57e-40d5-ac0b-4310a270114b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b9ed5d84-a266-4df5-8f28-f764868a810d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_6859aece-a0b1-4411-a12a-040e6eb928c6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b9ed5d84-a266-4df5-8f28-f764868a810d" xlink:to="loc_us-gaap_LineOfCreditMember_6859aece-a0b1-4411-a12a-040e6eb928c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_OtherDebtMember_9dd07453-f3b7-4490-bbd9-fc3f90141ee2" xlink:href="fwrg-20240929.xsd#fwrg_OtherDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b9ed5d84-a266-4df5-8f28-f764868a810d" xlink:to="loc_fwrg_OtherDebtMember_9dd07453-f3b7-4490-bbd9-fc3f90141ee2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_3431663d-5b1a-4c35-8e0e-b97bee132e90" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_3431663d-5b1a-4c35-8e0e-b97bee132e90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_c9b076db-1558-464a-b945-33b72d08db50" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_c9b076db-1558-464a-b945-33b72d08db50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_5d7b83f0-b7a5-476e-99cb-a24a0c7565da" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_FinanceLeaseLiability_5d7b83f0-b7a5-476e-99cb-a24a0c7565da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_a7f5e7f4-cc80-4e5e-a04f-4b1b25af9847" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_a7f5e7f4-cc80-4e5e-a04f-4b1b25af9847" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_64adb70c-9c65-4713-9b45-b403642984b0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_64adb70c-9c65-4713-9b45-b403642984b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_5fbdd8a6-417e-42ab-9f9c-2ae14ea10d33" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent_5fbdd8a6-417e-42ab-9f9c-2ae14ea10d33" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_401f54fe-8c4f-4f81-b99e-82eeb70335ad" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_bdc9489b-898c-4fe9-b102-21b87441edcf" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_401f54fe-8c4f-4f81-b99e-82eeb70335ad" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#DebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_edd5a731-5a07-4ba1-b1e7-f0ca32920500" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:to="loc_us-gaap_CreditFacilityAxis_edd5a731-5a07-4ba1-b1e7-f0ca32920500" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_edd5a731-5a07-4ba1-b1e7-f0ca32920500_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_edd5a731-5a07-4ba1-b1e7-f0ca32920500" xlink:to="loc_us-gaap_CreditFacilityDomain_edd5a731-5a07-4ba1-b1e7-f0ca32920500_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_edd5a731-5a07-4ba1-b1e7-f0ca32920500" xlink:to="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_TermFacilityMember_76c1215e-6dd7-457f-9b63-2882364764b9" xlink:href="fwrg-20240929.xsd#fwrg_TermFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:to="loc_fwrg_TermFacilityMember_76c1215e-6dd7-457f-9b63-2882364764b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_85324cea-2723-4498-adfa-60a200173e58" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_85324cea-2723-4498-adfa-60a200173e58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NewTermFacilityMember_53f81c6f-f007-41d3-8311-4cc1e14fb561" xlink:href="fwrg-20240929.xsd#fwrg_NewTermFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:to="loc_fwrg_NewTermFacilityMember_53f81c6f-f007-41d3-8311-4cc1e14fb561" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NewRevolvingCreditFacilityMember_98ccdb2a-cc09-4553-a2ee-d1810c3abb13" xlink:href="fwrg-20240929.xsd#fwrg_NewRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:to="loc_fwrg_NewRevolvingCreditFacilityMember_98ccdb2a-cc09-4553-a2ee-d1810c3abb13" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NewDelayedDrawTermFacilityMember_e4095bf0-8b8c-4ee2-a2fd-29cdec63778a" xlink:href="fwrg-20240929.xsd#fwrg_NewDelayedDrawTermFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_7cfbdf41-4b6b-4d32-aadf-55b7d8ad5b3e" xlink:to="loc_fwrg_NewDelayedDrawTermFacilityMember_e4095bf0-8b8c-4ee2-a2fd-29cdec63778a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_ec1f7a27-978b-4f2c-bb7e-e2fe0a762323" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:to="loc_us-gaap_DebtInstrumentAxis_ec1f7a27-978b-4f2c-bb7e-e2fe0a762323" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_ec1f7a27-978b-4f2c-bb7e-e2fe0a762323_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_ec1f7a27-978b-4f2c-bb7e-e2fe0a762323" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_ec1f7a27-978b-4f2c-bb7e-e2fe0a762323_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f1a02dfa-94df-487f-9721-12685160bd49" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_ec1f7a27-978b-4f2c-bb7e-e2fe0a762323" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f1a02dfa-94df-487f-9721-12685160bd49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NewFacilitiesMember_ecba5ffb-710b-476b-b9e0-0d5dc0254d28" xlink:href="fwrg-20240929.xsd#fwrg_NewFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f1a02dfa-94df-487f-9721-12685160bd49" xlink:to="loc_fwrg_NewFacilitiesMember_ecba5ffb-710b-476b-b9e0-0d5dc0254d28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_e40f4fab-a58e-4172-8057-e4f851c31ade" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_e40f4fab-a58e-4172-8057-e4f851c31ade" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_e40f4fab-a58e-4172-8057-e4f851c31ade_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e40f4fab-a58e-4172-8057-e4f851c31ade" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_e40f4fab-a58e-4172-8057-e4f851c31ade_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_054950de-c560-4b31-9589-348ece7f2d58" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_e40f4fab-a58e-4172-8057-e4f851c31ade" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_054950de-c560-4b31-9589-348ece7f2d58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_2511518e-d70e-4567-839c-b29a4c35c7fc" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_054950de-c560-4b31-9589-348ece7f2d58" xlink:to="loc_us-gaap_LineOfCreditMember_2511518e-d70e-4567-839c-b29a4c35c7fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9fcb34c5-0125-4419-8dc5-b2da4c96bc00" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:to="loc_srt_RangeAxis_9fcb34c5-0125-4419-8dc5-b2da4c96bc00" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9fcb34c5-0125-4419-8dc5-b2da4c96bc00_default" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9fcb34c5-0125-4419-8dc5-b2da4c96bc00" xlink:to="loc_srt_RangeMember_9fcb34c5-0125-4419-8dc5-b2da4c96bc00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1c487943-18cf-4741-952f-c2f586ffe8c1" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9fcb34c5-0125-4419-8dc5-b2da4c96bc00" xlink:to="loc_srt_RangeMember_1c487943-18cf-4741-952f-c2f586ffe8c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ac8c21c0-724f-4fab-aad4-67e82aa88c8d" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1c487943-18cf-4741-952f-c2f586ffe8c1" xlink:to="loc_srt_MinimumMember_ac8c21c0-724f-4fab-aad4-67e82aa88c8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_161559b6-3875-404c-bc80-45d5d34b7bf2" xlink:href="https://xbrl.fasb.org/srt/2024/elts/srt-2024.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1c487943-18cf-4741-952f-c2f586ffe8c1" xlink:to="loc_srt_MaximumMember_161559b6-3875-404c-bc80-45d5d34b7bf2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_64e76960-5258-4e84-9363-446c26da1a44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:to="loc_us-gaap_VariableRateAxis_64e76960-5258-4e84-9363-446c26da1a44" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_64e76960-5258-4e84-9363-446c26da1a44_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_64e76960-5258-4e84-9363-446c26da1a44" xlink:to="loc_us-gaap_VariableRateDomain_64e76960-5258-4e84-9363-446c26da1a44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_0e75b800-4efe-46c6-88ec-56959b6315f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_64e76960-5258-4e84-9363-446c26da1a44" xlink:to="loc_us-gaap_VariableRateDomain_0e75b800-4efe-46c6-88ec-56959b6315f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_AdjustedLeverageRateMember_fda0bd72-c22a-41aa-abaf-5898fd26f043" xlink:href="fwrg-20240929.xsd#fwrg_AdjustedLeverageRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0e75b800-4efe-46c6-88ec-56959b6315f1" xlink:to="loc_fwrg_AdjustedLeverageRateMember_fda0bd72-c22a-41aa-abaf-5898fd26f043" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_e9607d69-e3b5-4dd6-b840-c2f87b7a9569" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0e75b800-4efe-46c6-88ec-56959b6315f1" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_e9607d69-e3b5-4dd6-b840-c2f87b7a9569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_909aa634-7769-4d80-90c4-45e02734db16" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ad62b9a4-bf55-4d31-b4ce-f1855fe2eec0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_909aa634-7769-4d80-90c4-45e02734db16" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_909aa634-7769-4d80-90c4-45e02734db16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_909aa634-7769-4d80-90c4-45e02734db16" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_909aa634-7769-4d80-90c4-45e02734db16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_09bcf8dd-3254-4c6c-8f85-d7a712daa643" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_909aa634-7769-4d80-90c4-45e02734db16" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_09bcf8dd-3254-4c6c-8f85-d7a712daa643" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_a04550a9-7b7f-468c-8376-121eab695043" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_09bcf8dd-3254-4c6c-8f85-d7a712daa643" xlink:to="loc_us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember_a04550a9-7b7f-468c-8376-121eab695043" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_285099a5-e809-412f-b69a-577f722a4a44" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_285099a5-e809-412f-b69a-577f722a4a44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_2fcc353c-8ddc-4f4f-be64-7eac387d477e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_LineOfCreditFacilityIncreaseDecreaseForPeriodNet_2fcc353c-8ddc-4f4f-be64-7eac387d477e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityExpirationPeriod_532ce2b0-f42a-4956-a88b-75e3f56ccc34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditFacilityExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_LineOfCreditFacilityExpirationPeriod_532ce2b0-f42a-4956-a88b-75e3f56ccc34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_ffec3c44-714b-4e93-ba71-043ab24efd7b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_ffec3c44-714b-4e93-ba71-043ab24efd7b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_9f27b171-f0e2-4924-aa46-32d8ea2cce4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_9f27b171-f0e2-4924-aa46-32d8ea2cce4a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_a67278ec-e335-4dff-99ef-359befb87386" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_a67278ec-e335-4dff-99ef-359befb87386" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_5a80371e-cd1d-4ac6-a0d2-b537d804d592" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_40bb0535-0f49-414f-a0b1-a21e8214f352" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_5a80371e-cd1d-4ac6-a0d2-b537d804d592" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/DebtScheduleofEstimatedFairValueoftheOutstandingDebtExcludingFinanceLeaseLiabilitiesandFinancingObligationsDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#DebtScheduleofEstimatedFairValueoftheOutstandingDebtExcludingFinanceLeaseLiabilitiesandFinancingObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/DebtScheduleofEstimatedFairValueoftheOutstandingDebtExcludingFinanceLeaseLiabilitiesandFinancingObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0ae527cd-7aaf-48d3-a67e-563e488b5201" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c1bf0609-8786-4995-b3f4-94ca181d3055" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0ae527cd-7aaf-48d3-a67e-563e488b5201" xlink:to="loc_us-gaap_DebtInstrumentTable_c1bf0609-8786-4995-b3f4-94ca181d3055" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1ccd564b-c1b8-4edd-97db-72835ddebb86" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c1bf0609-8786-4995-b3f4-94ca181d3055" xlink:to="loc_us-gaap_CreditFacilityAxis_1ccd564b-c1b8-4edd-97db-72835ddebb86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1ccd564b-c1b8-4edd-97db-72835ddebb86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1ccd564b-c1b8-4edd-97db-72835ddebb86" xlink:to="loc_us-gaap_CreditFacilityDomain_1ccd564b-c1b8-4edd-97db-72835ddebb86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_bca1d470-f509-4f80-92b4-b43e2657f511" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1ccd564b-c1b8-4edd-97db-72835ddebb86" xlink:to="loc_us-gaap_CreditFacilityDomain_bca1d470-f509-4f80-92b4-b43e2657f511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_TermFacilityMember_55b49ec0-c72c-47ad-9fa8-04a8f41f22c0" xlink:href="fwrg-20240929.xsd#fwrg_TermFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bca1d470-f509-4f80-92b4-b43e2657f511" xlink:to="loc_fwrg_TermFacilityMember_55b49ec0-c72c-47ad-9fa8-04a8f41f22c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DelayedDrawTermLoanMember_94f34f6c-f67c-40d8-bdf0-a5836281b5f1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DelayedDrawTermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bca1d470-f509-4f80-92b4-b43e2657f511" xlink:to="loc_us-gaap_DelayedDrawTermLoanMember_94f34f6c-f67c-40d8-bdf0-a5836281b5f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_7784ad76-8226-4f26-8951-a7b7cbfe0ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_bca1d470-f509-4f80-92b4-b43e2657f511" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_7784ad76-8226-4f26-8951-a7b7cbfe0ee3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_815df370-6675-4ce8-9045-b76dc9f8b3e0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c1bf0609-8786-4995-b3f4-94ca181d3055" xlink:to="loc_us-gaap_DebtInstrumentAxis_815df370-6675-4ce8-9045-b76dc9f8b3e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_815df370-6675-4ce8-9045-b76dc9f8b3e0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_815df370-6675-4ce8-9045-b76dc9f8b3e0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_815df370-6675-4ce8-9045-b76dc9f8b3e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_da0157fd-2117-4636-ba59-97e73c3014fe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_815df370-6675-4ce8-9045-b76dc9f8b3e0" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_da0157fd-2117-4636-ba59-97e73c3014fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NewFacilitiesMember_eb079049-4ac9-4341-872d-658dd6c5e490" xlink:href="fwrg-20240929.xsd#fwrg_NewFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_da0157fd-2117-4636-ba59-97e73c3014fe" xlink:to="loc_fwrg_NewFacilitiesMember_eb079049-4ac9-4341-872d-658dd6c5e490" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_caea6a1a-bd08-407a-9aff-35d2d156a98e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c1bf0609-8786-4995-b3f4-94ca181d3055" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_caea6a1a-bd08-407a-9aff-35d2d156a98e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_caea6a1a-bd08-407a-9aff-35d2d156a98e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_caea6a1a-bd08-407a-9aff-35d2d156a98e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_caea6a1a-bd08-407a-9aff-35d2d156a98e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_6a702c46-1203-4d00-ae0b-f4530a0f605e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_caea6a1a-bd08-407a-9aff-35d2d156a98e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_6a702c46-1203-4d00-ae0b-f4530a0f605e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_5dfd875c-fc79-4d30-bec2-e994d8ed1286" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_6a702c46-1203-4d00-ae0b-f4530a0f605e" xlink:to="loc_us-gaap_LineOfCreditMember_5dfd875c-fc79-4d30-bec2-e994d8ed1286" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8dae2e8a-fc4b-446c-b9e0-37d0a0aece72" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c1bf0609-8786-4995-b3f4-94ca181d3055" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8dae2e8a-fc4b-446c-b9e0-37d0a0aece72" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8dae2e8a-fc4b-446c-b9e0-37d0a0aece72_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8dae2e8a-fc4b-446c-b9e0-37d0a0aece72" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8dae2e8a-fc4b-446c-b9e0-37d0a0aece72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08d67326-833b-481b-88a6-cf314415d69e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_8dae2e8a-fc4b-446c-b9e0-37d0a0aece72" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08d67326-833b-481b-88a6-cf314415d69e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_61f68d2c-8cf5-4866-a61d-1f0ae9ad9083" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08d67326-833b-481b-88a6-cf314415d69e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_61f68d2c-8cf5-4866-a61d-1f0ae9ad9083" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_e5c747d9-d3a4-4d3e-9bcd-9dfa45d9b50b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0ae527cd-7aaf-48d3-a67e-563e488b5201" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_e5c747d9-d3a4-4d3e-9bcd-9dfa45d9b50b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_bc32bfb8-2818-4e56-8b08-4790bfd996b8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0ae527cd-7aaf-48d3-a67e-563e488b5201" xlink:to="loc_us-gaap_LongTermDebtFairValue_bc32bfb8-2818-4e56-8b08-4790bfd996b8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/InterestRateSwapsDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#InterestRateSwapsDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/InterestRateSwapsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_7b58d5ec-cd9d-4fba-909b-0085e9022972" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_us-gaap_DerivativeTable_7b58d5ec-cd9d-4fba-909b-0085e9022972" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_d8ffadd3-666f-4dd3-bf67-ac53aeb2ee43" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_7b58d5ec-cd9d-4fba-909b-0085e9022972" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_d8ffadd3-666f-4dd3-bf67-ac53aeb2ee43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_d8ffadd3-666f-4dd3-bf67-ac53aeb2ee43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_d8ffadd3-666f-4dd3-bf67-ac53aeb2ee43" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_d8ffadd3-666f-4dd3-bf67-ac53aeb2ee43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_705d857e-1503-4289-a6bc-4396b4bb6179" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_d8ffadd3-666f-4dd3-bf67-ac53aeb2ee43" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_705d857e-1503-4289-a6bc-4396b4bb6179" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_6e8211ed-f92f-4ae2-b675-dfceda1f67df" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_705d857e-1503-4289-a6bc-4396b4bb6179" xlink:to="loc_us-gaap_InterestRateSwapMember_6e8211ed-f92f-4ae2-b675-dfceda1f67df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_f758e5b2-6434-4abc-aa0e-f10fad1392e8" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NumberOfInterestRateDerivativesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_f758e5b2-6434-4abc-aa0e-f10fad1392e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_c961c869-bd95-436c-8263-b261e31e46d1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_us-gaap_DerivativeNotionalAmount_c961c869-bd95-436c-8263-b261e31e46d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAverageFixedInterestRate_8fd30171-5df2-44e6-99b6-3cd07cdc06d9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_DerivativeAverageFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_us-gaap_DerivativeAverageFixedInterestRate_8fd30171-5df2-44e6-99b6-3cd07cdc06d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_NumberOfAdditionalInterestRateDerivativesEnteredInto_7d752759-cbf2-42bb-8713-16e1979b961c" xlink:href="fwrg-20240929.xsd#fwrg_NumberOfAdditionalInterestRateDerivativesEnteredInto"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_fwrg_NumberOfAdditionalInterestRateDerivativesEnteredInto_7d752759-cbf2-42bb-8713-16e1979b961c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_5edad32b-1c74-48f7-9236-748a13204d23" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_5edad32b-1c74-48f7-9236-748a13204d23" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_12aac930-a224-462d-baf5-2ee66a94645d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_e27b3615-495a-4271-b818-d836db5d0947" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_12aac930-a224-462d-baf5-2ee66a94645d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/EquityandStockBasedCompensationAdditionalInformationDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#EquityandStockBasedCompensationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/EquityandStockBasedCompensationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6a815945-74bc-40a3-8a6e-2bd471ea2bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6a815945-74bc-40a3-8a6e-2bd471ea2bb0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_8943c0ee-602e-4e67-9d57-e28da1814d73" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6a815945-74bc-40a3-8a6e-2bd471ea2bb0" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_8943c0ee-602e-4e67-9d57-e28da1814d73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_8943c0ee-602e-4e67-9d57-e28da1814d73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_8943c0ee-602e-4e67-9d57-e28da1814d73" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_8943c0ee-602e-4e67-9d57-e28da1814d73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_96bba23e-ed4d-4e1f-8ac4-f61c3bc40b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_8943c0ee-602e-4e67-9d57-e28da1814d73" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_96bba23e-ed4d-4e1f-8ac4-f61c3bc40b0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_SecondaryPublicOfferingMember_f317aa5a-4c57-464e-8768-994f3ca260c3" xlink:href="fwrg-20240929.xsd#fwrg_SecondaryPublicOfferingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_96bba23e-ed4d-4e1f-8ac4-f61c3bc40b0d" xlink:to="loc_fwrg_SecondaryPublicOfferingMember_f317aa5a-4c57-464e-8768-994f3ca260c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OverAllotmentOptionMember_4254efca-208f-4c0a-9b96-263925124af4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_OverAllotmentOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_96bba23e-ed4d-4e1f-8ac4-f61c3bc40b0d" xlink:to="loc_us-gaap_OverAllotmentOptionMember_4254efca-208f-4c0a-9b96-263925124af4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_93792645-9bfb-45fc-a289-f8e719e4434a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6a815945-74bc-40a3-8a6e-2bd471ea2bb0" xlink:to="loc_us-gaap_AwardTypeAxis_93792645-9bfb-45fc-a289-f8e719e4434a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_93792645-9bfb-45fc-a289-f8e719e4434a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_93792645-9bfb-45fc-a289-f8e719e4434a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_93792645-9bfb-45fc-a289-f8e719e4434a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cc35fac9-b005-4424-b638-84359b048dc2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_93792645-9bfb-45fc-a289-f8e719e4434a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cc35fac9-b005-4424-b638-84359b048dc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_83282c57-fbd6-4c7f-8808-53bb5749bf4a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cc35fac9-b005-4424-b638-84359b048dc2" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_83282c57-fbd6-4c7f-8808-53bb5749bf4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_1bdba93e-69fe-4188-b95f-3d690d5191ca" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_6a815945-74bc-40a3-8a6e-2bd471ea2bb0" xlink:to="loc_us-gaap_VestingAxis_1bdba93e-69fe-4188-b95f-3d690d5191ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_1bdba93e-69fe-4188-b95f-3d690d5191ca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_1bdba93e-69fe-4188-b95f-3d690d5191ca" xlink:to="loc_us-gaap_VestingDomain_1bdba93e-69fe-4188-b95f-3d690d5191ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_5b6b9b6e-daab-489e-8129-c1c76753c4ef" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_1bdba93e-69fe-4188-b95f-3d690d5191ca" xlink:to="loc_us-gaap_VestingDomain_5b6b9b6e-daab-489e-8129-c1c76753c4ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_ThreeYearsMember_dedddfd1-52c3-471d-a7ed-98cb088843f5" xlink:href="fwrg-20240929.xsd#fwrg_ThreeYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_5b6b9b6e-daab-489e-8129-c1c76753c4ef" xlink:to="loc_fwrg_ThreeYearsMember_dedddfd1-52c3-471d-a7ed-98cb088843f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_OneYearMember_bdaf2dc3-afa4-4ed9-851f-5c7de178aba0" xlink:href="fwrg-20240929.xsd#fwrg_OneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_5b6b9b6e-daab-489e-8129-c1c76753c4ef" xlink:to="loc_fwrg_OneYearMember_bdaf2dc3-afa4-4ed9-851f-5c7de178aba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_SecondAnniversaryMember_f8c96286-7230-4d4a-aeab-c960ba15b027" xlink:href="fwrg-20240929.xsd#fwrg_SecondAnniversaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_5b6b9b6e-daab-489e-8129-c1c76753c4ef" xlink:to="loc_fwrg_SecondAnniversaryMember_f8c96286-7230-4d4a-aeab-c960ba15b027" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_ThirdAnniversaryMember_60c6adf8-b2df-4571-bba9-e00952b83df6" xlink:href="fwrg-20240929.xsd#fwrg_ThirdAnniversaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_5b6b9b6e-daab-489e-8129-c1c76753c4ef" xlink:to="loc_fwrg_ThirdAnniversaryMember_60c6adf8-b2df-4571-bba9-e00952b83df6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_efebd6b1-6f5d-4ce4-a5d2-422cec857a3d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction_efebd6b1-6f5d-4ce4-a5d2-422cec857a3d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_OfferingAndRegistrationCosts_c2a166ba-2e1c-473c-a290-8d5cfc1cbcf9" xlink:href="fwrg-20240929.xsd#fwrg_OfferingAndRegistrationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_fwrg_OfferingAndRegistrationCosts_c2a166ba-2e1c-473c-a290-8d5cfc1cbcf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_bd3a2576-902e-4d41-82b4-50207190f5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_bd3a2576-902e-4d41-82b4-50207190f5fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9acc4055-33cb-4e7f-8759-982c1955042f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_9acc4055-33cb-4e7f-8759-982c1955042f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_ecec6596-b61f-49d1-ba87-e1afa792b882" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_ecec6596-b61f-49d1-ba87-e1afa792b882" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_a8385ff0-520d-4ae3-a899-a7294e1a87b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_a8385ff0-520d-4ae3-a899-a7294e1a87b9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_2e61667e-c4d8-43b8-b599-8ffacda72c34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_SharePrice_2e61667e-c4d8-43b8-b599-8ffacda72c34" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_26fdfc8e-deec-47c2-a549-f517f85f6d2b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_26fdfc8e-deec-47c2-a549-f517f85f6d2b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_7184cec7-fad7-4383-b617-10f9dbc2ddfe" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a44e5f88-c52f-417f-b02c-4cc23fe25c56" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_7184cec7-fad7-4383-b617-10f9dbc2ddfe" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/EquityandStockBasedCompensationScheduleofNonvestedRestrictedStockUnitsActivityDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#EquityandStockBasedCompensationScheduleofNonvestedRestrictedStockUnitsActivityDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/EquityandStockBasedCompensationScheduleofNonvestedRestrictedStockUnitsActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_afb117fa-2fba-4c2b-baa9-cc99fbbf32fb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_31c41182-a9d6-4e56-b1ab-2df9e91baddb" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_afb117fa-2fba-4c2b-baa9-cc99fbbf32fb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_31c41182-a9d6-4e56-b1ab-2df9e91baddb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_cf21474e-aa29-4af9-b5ca-4d2d9bdb47ba" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_31c41182-a9d6-4e56-b1ab-2df9e91baddb" xlink:to="loc_us-gaap_AwardTypeAxis_cf21474e-aa29-4af9-b5ca-4d2d9bdb47ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cf21474e-aa29-4af9-b5ca-4d2d9bdb47ba_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_cf21474e-aa29-4af9-b5ca-4d2d9bdb47ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_cf21474e-aa29-4af9-b5ca-4d2d9bdb47ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7333fd7f-929f-4c62-a482-847118422dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_cf21474e-aa29-4af9-b5ca-4d2d9bdb47ba" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7333fd7f-929f-4c62-a482-847118422dd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_ada8baeb-21a0-42bf-9b0b-117efb0a1c87" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7333fd7f-929f-4c62-a482-847118422dd0" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_ada8baeb-21a0-42bf-9b0b-117efb0a1c87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_14a9a02e-b58f-4617-9ac4-5829c604b831" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_afb117fa-2fba-4c2b-baa9-cc99fbbf32fb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_14a9a02e-b58f-4617-9ac4-5829c604b831" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0e744607-abae-4af3-9ed0-4b0f89ffa9a1" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_14a9a02e-b58f-4617-9ac4-5829c604b831" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_0e744607-abae-4af3-9ed0-4b0f89ffa9a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_ee0d460a-b126-456f-859a-7e9925bfa18d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_14a9a02e-b58f-4617-9ac4-5829c604b831" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_ee0d460a-b126-456f-859a-7e9925bfa18d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3b1b8460-5268-4799-ad92-185a50ced221" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_14a9a02e-b58f-4617-9ac4-5829c604b831" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_3b1b8460-5268-4799-ad92-185a50ced221" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3d43c01c-abc3-4568-8404-0187ee8fd671" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_14a9a02e-b58f-4617-9ac4-5829c604b831" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_3d43c01c-abc3-4568-8404-0187ee8fd671" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_250224e0-5510-4057-9e59-d7f6ce10eab6" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c3fb01af-a6c1-4145-b587-952f67fc544b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_afb117fa-2fba-4c2b-baa9-cc99fbbf32fb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c3fb01af-a6c1-4145-b587-952f67fc544b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9cd78b3d-e217-4841-a79e-b1e8eb9f6596" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c3fb01af-a6c1-4145-b587-952f67fc544b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9cd78b3d-e217-4841-a79e-b1e8eb9f6596" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_338ee51d-394c-4a70-8daf-c8647615f1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c3fb01af-a6c1-4145-b587-952f67fc544b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_338ee51d-394c-4a70-8daf-c8647615f1f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_ba379e4c-5b20-44f9-b0d4-cf3a6ac44206" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c3fb01af-a6c1-4145-b587-952f67fc544b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_ba379e4c-5b20-44f9-b0d4-cf3a6ac44206" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d73d998a-2ac4-4a98-b668-d29d257d1627" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_c3fb01af-a6c1-4145-b587-952f67fc544b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_d73d998a-2ac4-4a98-b668-d29d257d1627" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_d239ed18-8885-459e-9373-33b2fc1cc4ae" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_2e8774a0-b8fc-4e57-b329-2b4c114de64a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_afb117fa-2fba-4c2b-baa9-cc99fbbf32fb" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_2e8774a0-b8fc-4e57-b329-2b4c114de64a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_9cdf37a1-f799-406e-8701-47ea4a2c0f67" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_2e8774a0-b8fc-4e57-b329-2b4c114de64a" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_9cdf37a1-f799-406e-8701-47ea4a2c0f67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested_8a0b186c-c5d6-468e-a53a-1e9578f662bd" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/EquityandStockBasedCompensationScheduleofUnrecognizedStockbasedCompensationExpenseDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#EquityandStockBasedCompensationScheduleofUnrecognizedStockbasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/EquityandStockBasedCompensationScheduleofUnrecognizedStockbasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3d4cb3b8-4ff8-4d67-a1ae-3790aa399fe4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_22ccd366-9bb1-47ea-9145-28ee1be0bb36" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3d4cb3b8-4ff8-4d67-a1ae-3790aa399fe4" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_22ccd366-9bb1-47ea-9145-28ee1be0bb36" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ac74d28d-8a43-4eab-bfcd-014455767e28" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_22ccd366-9bb1-47ea-9145-28ee1be0bb36" xlink:to="loc_us-gaap_AwardTypeAxis_ac74d28d-8a43-4eab-bfcd-014455767e28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ac74d28d-8a43-4eab-bfcd-014455767e28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ac74d28d-8a43-4eab-bfcd-014455767e28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ac74d28d-8a43-4eab-bfcd-014455767e28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_19be11fd-399d-4c83-9b4a-83ab1c7e4eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ac74d28d-8a43-4eab-bfcd-014455767e28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_19be11fd-399d-4c83-9b4a-83ab1c7e4eb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_b2e07d31-997a-4456-9e08-5e99e7606d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_19be11fd-399d-4c83-9b4a-83ab1c7e4eb4" xlink:to="loc_us-gaap_EmployeeStockOptionMember_b2e07d31-997a-4456-9e08-5e99e7606d0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_aca061db-016a-4ea0-a9f4-bda1d922a29b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_19be11fd-399d-4c83-9b4a-83ab1c7e4eb4" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_aca061db-016a-4ea0-a9f4-bda1d922a29b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_a301d1f7-bc16-470c-b039-79f2cb88c69d" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3d4cb3b8-4ff8-4d67-a1ae-3790aa399fe4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_a301d1f7-bc16-470c-b039-79f2cb88c69d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e680b2c8-6a09-4972-bc6c-6c5f8cab6b34" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3d4cb3b8-4ff8-4d67-a1ae-3790aa399fe4" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_e680b2c8-6a09-4972-bc6c-6c5f8cab6b34" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.firstwatch.com/role/NetIncomePerCommonShareDetails" xlink:type="simple" xlink:href="fwrg-20240929.xsd#NetIncomePerCommonShareDetails"/>
  <link:definitionLink xlink:role="http://www.firstwatch.com/role/NetIncomePerCommonShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_3b8a866b-4b13-4076-ac48-7c8855903468" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_3b8a866b-4b13-4076-ac48-7c8855903468" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_91325cf0-c83e-4d4c-b121-f954637ca5af" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_3b8a866b-4b13-4076-ac48-7c8855903468" xlink:to="loc_us-gaap_AwardTypeAxis_91325cf0-c83e-4d4c-b121-f954637ca5af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_91325cf0-c83e-4d4c-b121-f954637ca5af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_91325cf0-c83e-4d4c-b121-f954637ca5af" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_91325cf0-c83e-4d4c-b121-f954637ca5af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58c9cc75-1661-44a1-be8d-5c1fde866603" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_91325cf0-c83e-4d4c-b121-f954637ca5af" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58c9cc75-1661-44a1-be8d-5c1fde866603" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_4471df5f-7b9a-4d68-b308-c119d294bdb9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58c9cc75-1661-44a1-be8d-5c1fde866603" xlink:to="loc_us-gaap_EmployeeStockOptionMember_4471df5f-7b9a-4d68-b308-c119d294bdb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_72c28501-302f-4c35-bafa-cc61dbbcc4b9" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_58c9cc75-1661-44a1-be8d-5c1fde866603" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_72c28501-302f-4c35-bafa-cc61dbbcc4b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_15c0ec0d-8c32-41d4-9848-85111001bb3c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_15c0ec0d-8c32-41d4-9848-85111001bb3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4ef59b97-1529-42a7-9354-285bd437ccaf" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_15c0ec0d-8c32-41d4-9848-85111001bb3c" xlink:to="loc_us-gaap_NetIncomeLoss_4ef59b97-1529-42a7-9354-285bd437ccaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_adb82940-53ad-4f74-9c17-c2397813943c" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_adb82940-53ad-4f74-9c17-c2397813943c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_770129b0-a92e-45a7-876d-7cbc3e1b3f00" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_adb82940-53ad-4f74-9c17-c2397813943c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_770129b0-a92e-45a7-876d-7cbc3e1b3f00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a473b239-ebc7-41e4-b954-a420868f1222" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasicAbstract_adb82940-53ad-4f74-9c17-c2397813943c" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a473b239-ebc7-41e4-b954-a420868f1222" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_5b337557-59e3-4423-968d-598269ad7074" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:to="loc_us-gaap_EarningsPerShareBasic_5b337557-59e3-4423-968d-598269ad7074" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_2abb7768-b590-49f6-8230-7c45a4849c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:to="loc_us-gaap_EarningsPerShareDiluted_2abb7768-b590-49f6-8230-7c45a4849c5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_7b1cd71e-c1d6-4d8f-b762-7cb2e6567e5b" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_1ee4e595-3145-402c-b187-e1cc9105eb8f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_7b1cd71e-c1d6-4d8f-b762-7cb2e6567e5b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2024/ecd-2024.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-roles-2024.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_fwrg_PortionOfLongTermDebtCurrent_994fead0-ad2e-4379-8c21-129fd70f614a" xlink:href="fwrg-20240929.xsd#fwrg_PortionOfLongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_fwrg_PortionOfLongTermDebtCurrent_994fead0-ad2e-4379-8c21-129fd70f614a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
