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play it cool

1

Act cautiously and shrewdly, as in When they asked how much she earned, she played it cool. [Slang; 1940s]

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2

Become or remain calm, as in When they start to tease you, just play it cool. [Slang; 1940s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.