assure
verb
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to tell somebody the truth of something with the intention of giving the listener confidence“I assured them that traveling to Cambodia was safe.”
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to make a promise or commitment“They assured me they would be at the meeting.”promise
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to inform positively and with certainty and confidence“I assure you that I am quite alright.”tell
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to cause to feel sure“My friends assured me that I did everything I could to avoid trouble.”reassure