lose one's cool

Slang Dictionary

lose (one's) cool definition

  1. tv.
    to lose control; to lose one's temper. (Compare this with keep (one's) cool.) : Now, don't lose your cool. Relax.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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