keep one's cool

Idioms  

1. 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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Example Sentences

It’s hard to keep one’s cool, casually sexist or otherwise, reading poems like “The Whole World Gets Together and Gangbangs a Deer” or “He Marries the Stuffed-Owl Exhibit,” a poem less about marriage than consummation.

From The New Yorker

Or, for that matter, how to keep one's cool when Dustin Brown is on the ice.

From The Guardian