Meaning of “jump in at the deep end” in the English Dictionary

british dictionary

"jump in at the deep end" in British English

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jump in at the deep end

also throw sb in at the deep end

C2 If you jump or are thrown in at the deep end, you start doing something new and difficult without help or preparation.

(Definition of “jump in at the deep end” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)