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3. rest assured

rest assured

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rest assured

to be assured; to be certain. Rest assured that you'll receive the best of care. Please rest assured that we will do everything possible to help.

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rest assured

to be certain something will happen I know this fellow well, and you can rest assured he will give you good advice.

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rest assured

You can be sure, as in Rest assured that the police will recover your diamonds. This expression uses assured in the sense of "certain" or "confident," a usage dating from the early 1500s.

See also: rest