lose one's cool
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British pronunciation/lˈuːz wˈɒnz kˈuːl/
American pronunciation/lˈuːz wˈʌnz kˈuːl/

to become suddenly very angry, often to the point of shouting or behaving in an aggressive manner

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to [lose] {one's} cool definition and meaning

What is the origin of the idiom "lose one's cool" and when to use it?

The origin of the idiom "lose one's cool" can be traced to American English slang from the mid-20th century. The term "cool" in this context refers to maintaining a calm, composed, and unruffled demeanor. It can be employed in personal relationships during arguments or conflicts when individuals become overwhelmed by their emotions and react impulsively. In professional settings, it may be used to describe moments of high stress or pressure, such as during presentations, meetings, or negotiations, when someone becomes visibly flustered or unable to maintain a calm demeanor.

She is afraid she will lose her cool during the upcoming interview.
I lost my cool yesterday when my computer crashed.
I will be losing my cool while dealing with the difficult client tomorrow.
He lost his cool and shouted at his colleague in the meeting.
By the time the meeting was over, Roger had fully got a grip on himself after momentarily losing his cool when criticized.
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Meaning of "To [lose] {one's} cool"
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