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guarantee

verb [T] (PROMISE)
 
 
/ˌɡær.ənˈtiː/

Definition

If a product is guaranteed, the company that made it promises to repair or change it if a fault develops within a particular period of time: The fridge is guaranteed for three years.Making and breaking promises and commitments B2 to promise that something will happen or exist: [+ two objects] European Airlines guarantees its customers top-quality service. The label on this bread says it is guaranteed free of/from preservatives (= it contains no preservatives).Making and breaking promises and commitments If you guarantee someone's debt, you formally promise to accept the responsibility for that debt if the person fails to pay it.InsuranceMaking and breaking promises and commitments
(Definition of guarantee verb (PROMISE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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