Noun
The part of a swimming pool with relatively deep water
(idiomatic) A situation where expertise or experience is required.
Source: en.wiktionary.orgRoger became a part of me, and when he went off the deep end and became a mad snake, I felt sorry for him. Michael Zaslow
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. Brooke Burns
Challenge yourself, jump off the deep end and learn to swim. Carson Kressley
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. Stacy Keach
I like to scare myself and throw myself off the deep end. Samantha Barks
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. Teresa Palmer