the deep end

noun

Definition of the deep end 

informal

used in phrases such as throw in (at) the deep end and jump in (at) the deep end to describe starting a new and difficult activity when one is not fully prepared or ready to do it After graduating, he was not afraid to jump in at the deep end and start his new business alone.Teachers are thrown in the deep end when they first start teaching.

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to reject or criticize sharply

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