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English definition of “assure”

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assure

verb [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, 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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assure verb [T] (MAKE CERTAIN)

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

UK (of an organization) to promise to pay an amount of money to a person or their family if that person becomes ill, gets injured, or dies, in return for small regular payments
(Definition of assure from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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