assure - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “assure”

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assure

verb [T]  us   /əˈʃʊər/

assure verb [T] (PROMISE)

to promise or tell something to someone confidently or firmly, or to cause someone to feel certain by removing doubt: She assured him (that) the check was in the mail. The governor assured the voters (that) taxes would not be raised.

assure verb [T] (MAKE CERTAIN)

to cause something to be certain: Her future was assured when her performance drew rave reviews from all the critics.
(Definition of assure from the Cambridge Academic Content Dictionary © Cambridge University Press)
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