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Avoid these words. Seriously.

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
  • Something terrible has happened to the child, you may rest assured.

    Tanglewood Tales Nathaniel Hawthorne
  • Monsieur and Madame may rest assured that everything has been done.

  • rest assured that Beckendorff is not a man to act incautiously or weakly.

    Vivian Grey Earl of Beaconsfield, Benjamin Disraeli
  • You may rest assured of each of the facts related in this letter.

    Patrick Henry

    Moses Coit Tyler
  • We will do all in our power to aid you, rest assured of that.

    The Crevice

    William John Burns and Isabel Ostrander

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