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