To become very angry very quickly; suddenly lose one's temper.
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To suddenly get very angry and lose your temper.
When someone flies off the handle, the rage seems far bigger than the cause.
It's used when a person blows up out of nowhere.
"Lose Your Cool"
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To stop being calm and become visibly upset or agitated
"Blow Up"
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To suddenly explode in anger, often loudly and with consequences
"Fly off the Handle"
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Suddenly losing control of your temper in an explosive way that is far bigger than the situation calls for