go off the deep end

phrasal

1. : to enter recklessly upon a course : go off half-cocked : become rapidly involved (as in difficulties)

2. : to lose self-control : become very much excited

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go off the deep end

1. To express strong feelings without restraint

2. To lose one's temper completely

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Main Entry: ↑deep

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go off the deep end informal phrase

to unexpectedly become very angry, especially without a good reason

Thesaurus: to be, or to become angry or annoyed_synonym

Main entry: deep

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go off (or go in off) the deep end

informal give way immediately to an emotional outburst, esp. of anger

■ go mad; behave extremely strangely

they looked at me as if I had gone off the deep end

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go off the deep end — see ↑deep, 1

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Main Entry: ↑end

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go off the ˈdeep end idiom

(informal) to suddenly become very angry or emotional

Main entry: ↑deep_idiom