assure Meaning in the Cambridge English Dictionary
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Meaning of “assure” in the English Dictionary

"assure" in British English

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assureverb [T]

uk   /əˈʃɔːr/  us   /-ˈʃʊr/

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, ​yourcar will be ​readytomorrow," the ​mechanic assured him. [+ (that)] She assured him (that) the ​car would be ​ready the next ​day. The ​primeminister assured the ​electorate (that)taxes would not be ​increased after the ​election. You can rest assured (= ​feelconfident) that I shall be there as ​promised.
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assure verb [T] (MAKE CERTAIN)

C1 to ​cause something to be ​certain: The play's ​popularity has been assured by the ​critics' ​ravereviews.
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assure verb [T] (PROTECT)

UK (of an ​organization) to ​promise to ​pay an ​amount of ​money to a ​person or ​theirfamily if that ​personbecomesill, gets ​injured, or ​dies, in ​return for ​smallregularpayments
(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 ​feelcertain by ​removingdoubt: 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 ​performancedrewravereviews from all the ​critics.
(Definition of assure from the Cambridge Academic Content Dictionary © Cambridge University Press)
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