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keep one's cool

Retain one's composure and poise, as in Billy keeps his cool, no matter what the situation. This slangy usage dates from the mid-1900s, as do the antonyms blow one's cool and lose one's cool, as in Try not to blow your cool in front of the team, or Dad lost his cool when he saw Jim playing with matches. Also see keep cool.

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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.