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English definition of “assure”

assure

verb [T] (SAY WITH CERTAINTY)    /əˈʃɔːr/ US  /-ˈʃʊr/
B2 to tell someone confidently that something is true, especially so that they do not worry: The unions assured the new owners of the workers' loyalty to the company. [+ speech] "Don't worry, your car will be ready tomorrow," the mechanic assured him. [+ (that)] She assured him (that) the car would be ready the next day. The prime minister assured the electorate (that) taxes would not be increased after the election. You can rest assured (= feel confident) that I shall be there as promised.Reassuring
(Definition of assure verb (SAY WITH CERTAINTY) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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