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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.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Examples from the Web for rest assured
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  • rest assured my interest and assistance henceforth are at your command.

    Solaris Farm Milan C. Edson
  • Madame may rest assured,” she said quietly, “all shall be as she desires.

    A Woman's Will Anne Warner
  • And you may rest assured of our most cordial cooperation so far as it may become necessary in this pursuit.

  • You can rest assured that I have made every inquiry and that now I know.

    The Golden Face William Le Queux
  • That done, you may rest assured Thebes will be completely under the thumb of Lacedaemon and of us, your friends.

    Hellenica Xenophon

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