deep end
Noun
Meaning
The part of a swimming pool with relatively deep water
(idiomatic) A situation where expertise or experience is required.
Source: en.wiktionary.orgExamples
Roger became a part of me, and when he went off the deep end and became a mad snake, I felt sorry for him.
Ive been a swimmer and a diver for quite a while. It was something that I think I got too comfortable with, and I dove into my black-bottomed pool and hit the slope from the shallow end to the deep end. And I had a chin to chest paralyzing break.
Challenge yourself, jump off the deep end and learn to swim.
As a dad, he thinks that his philosophy is morally correct. He has no conscience whatsoever about letting his kids put a penny in a light socket to find out electricity is not so good for you, and if you want to learn how to swim, you have to be thrown into the deep end.
I like to scare myself and throw myself off the deep end.
I was thrown in the deep end at 18 when I got cast in a movie that I didn't audition for. The director just sort of found me and put me in a film, so the decision was really made for me.