Get very angry suddenly.
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To suddenly get very angry.
When someone hits the roof, the anger bursts out all at once, often over something they did not see coming.
It's used for a loud, visible blow-up rather than a slow simmer.
"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