lose one's cool/composure

idiom

Definition of lose one's cool/composure

: to become angry

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“Lose one's cool/composure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lose%20one%27s%20cool%2Fcomposure. Accessed 11 Apr. 2021.

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