Denotation vs. Connotation

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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Historical Examples
  • rest assured my interest and assistance henceforth are at your command.

    Solaris Farm Milan C. Edson
  • rest assured that Beckendorff is not a man to act incautiously or weakly.

    Vivian Grey Earl of Beaconsfield, Benjamin Disraeli
  • And you may rest assured of our most cordial cooperation so far as it may become necessary in this pursuit.

  • You may rest assured of each of the facts related in this letter.

    Patrick Henry Moses Coit Tyler
  • 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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