Lose one's cool

//ˈluːz wʌnz ˈkuːl// verb

Definitions

Verb
  1. 1
    To become upset or disconcerted; to lose one's temper. idiomatic

    "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."

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