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Phrase(s): play it cool
1. Inf. to do something while not revealing insecurities or incompetence; to act blasé. • Play it cool, man. Look like you belong there. • If the boss walks in, just play it cool. 2. Inf. to hold one’s temper. • Come on now. Let it pass. Play it cool. • Don’t let them get you mad. Play it cool.
McGrawhill's American Idioms And Phrasal Verbs
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1. Act cautiously and shrewdly, as in When they asked how much she earned, she played it cool. [Slang; 1940s] 2. Become or remain calm, as in When they start to tease you, just play it cool. [Slang; 1940s] play it safe Also, play safe. Avoid extreme risks, as in I played it safe and bet only a dollar, or Let's play safe and get a backup in case the announced speaker gets sick. [c. 1900]
American Heritage Idioms