Lose one's cool

//ˈluːz wʌnz ˈkuːl//

"Lose one's cool" in a Sentence (2 examples)

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.

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.

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