keep one's cool/composure

idiom

Definition of keep one's cool/composure

: to remain calm : to not become upset or angry He kept his cool even though it was clear that he was being unfairly treated. The performers struggled to keep their composure after several interruptions from the crowd.

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“Keep one's cool/composure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/keep%20one%27s%20cool%2Fcomposure. Accessed 27 Sep. 2020.

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