The deep end is the part of the pool where you cannot touch the bottom. Swim at the deep end.
Many modern pools have no shallow part at all, which changes how children are taught. To be thrown in at the deep end means being given a hard task with no preparation.
1noundeep endThe part of the pool where you cannot touch the bottom.
“He would not go past the rope into the deep end for a year.”
deep end is a place.
Practised in Swimming & Diving