lose one's cool

lose +‎ one's +‎ cool

• IPA^(key): /ˈluːz wʌnz ˈkuːl/

lose one's cool (third-person singular simple present loses one's cool, present participle losing one's cool, simple past and past participle lost one's cool)

1. (idiomatic) To become upset or disconcerted; to lose one's temper.
   • 1966, "To the Ludicrous," Time, 18 Nov.:

     But in his final singles match against Mandarino, the Menace lost his cool. Visibly rattled by noisy spectators, who chanted "Brasil! Bra-sil!" from the third set onward, he collapsed completely in the fifth set.

   • 2006, Stefanie Cohen, "Naomi Campbell Accused of Attacking Maid in Fit Over Jeans," FOXNews.com, 28 Apr. (retrieved 3 June 2009):

     The fiery femme fatale is notorious for losing her cool, and was once accused of hitting her secretary with a telephone and threatening to throw her from a moving car.

   • When things don't go your way, no matter how trivial, how do you react? Do you lose your cool and explode?

• (become upset): blow one's cool, blow one's top, go ape, go apeshit, hit the roof, hit the ceiling, lose it, lose one's temper, lose one's rag

• keep one's cool

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