cool it

cool it idiom
  1. Calm down, relax, as in John was beginning to seethe, but I told him to cool it. [Slang; c. 1950]
  2. Stop what one is doing, especially stop talking or behaving conspicuously, as in We'd be wise to cool it until the scandal blows over. It is also used as an imperative, as in Cool it! We'll be in trouble if anyone hears you. [Slang; c. 1950]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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