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English definition of “guarantee”

guarantee

verb [T]     /ˌɡærənˈtiː/ (present participle guaranteeing, past tense and past participle guaranteed)
PROMISE B2 to promise that something is true or will happen : Every child is guaranteed a place at a local school . [+ (that)] We can't guarantee that it will arrive in time .Making and breaking promises and commitments
PRODUCT If a company guarantees its products , it makes a written promise to repair them or give you a new one if they have a fault : The repair is guaranteed for 6 months .Insurance
(Definition of guarantee verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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