the deep end

the end of a swimming pool where the water is deepest

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the deep end

informal

1

— used in phrases like throw in (at) the deep end and jump in (at) the deep end to describe starting a new and difficult activity when you are 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.

2

◇ To go off the deep end is to go crazy, such as by behaving foolishly or by becoming very angry or upset.

Her friends thought she had gone off the deep end when she suddenly decided to quit her job.

After his wife died, he started going off the deep end.

I understand that you're angry, but there's no reason to go off the deep end.

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Main Entry: ↑deep