Get very angry suddenly.
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To suddenly become very angry.
When someone hits the roof, they react with explosive anger, usually over something unexpected or upsetting.
It's used to describe a strong, visible outburst rather than simmering frustration.
"Lose Your Cool"
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Becoming upset in a calmer, less explosive way
"Go Through the Roof"
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Prices or amounts rising very high, not a person's anger
"Hit the Roof"
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Exploding with sudden, very intense anger