Meaning of “assure” in the English Dictionary

"assure" in British English

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assureverb [ T ]

uk /əˈʃɔːr/ us /əˈʃʊr/

assure verb [ T ] (SAY WITH CERTAINTY)

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.

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(Definition of “assure” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"assure" in American English

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assureverb [ 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)