English Vocabulary tips & definition with Gymglish.
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to assure: to persuade, to convince; to ascertain, to check, to verify; to guarantee, to promise
I (can) assure you that the package will arrive tomorrow morning. I promise it will be there!
rest assured that: don't worry, it's certain that
Rest assured that we will not lose money on this deal. Don't worry, everything will be OK!

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