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English definition of “assure”

assure

verb [T] (PROMISE)   /əˈʃʊər/
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.
(Definition of assure verb (PROMISE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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