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English definition of “assure”

assure

verb [T]     /əˈʃɔːr/
PROMISE B2 to tell someone that something is definitely true, especially so that they do not worry: [+ (that)] She assured them that she would be all right.Making and breaking promises and commitments
MAKE CERTAIN to make something certain to happen: This loan should assure the company's future.CertaintyConfidence and self-assurance
(Definition of assure verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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