IdiomThe AbsurdEnglish

go off the deep end

Meaning: To become deeply involved with someone or something before one is ready; to go crazy.

Example: “He went off the deep end when his team lost the final.”

Equivalents in other languages

Origin: From swimming pools, where the deep end is where one gets out of one's depth. The phrase is recorded from the early 20th century, first meaning to become very angry or overexcited, then to go crazy.

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