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assure
/əˈʃɔːr/ verb [T]Definition
PROMISE › to tell someone that something is certainly true, especially so that they do not worry: [+ (that)] She assured them that she would be all right.
MAKE CERTAIN › to make something certain to happen: This loan should assure the company's future.
(Definition of assure verb from the Cambridge Learner's Dictionary
© Cambridge University Press)
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