These Swimming Idioms Won't be 'Out of Your Depth'
Swimming isn't just a good way to stay healthy, it's also where English gets some great expressions for talking about challenges. Here are some examples.
If you find yourself in a difficult situation where you may not have the skills you need, you could say you've been "thrown in the deep end." This refers to the "deep end" of a pool, which you should only go in if you know how to swim.
For example, if you got a difficult new job but weren't given any training, you could say "My boss really threw me in the deep end, I don’t know what I'm doing!"
Sometimes when you've been thrown in the deep end, you end up "out of your depth," like a person in water that's over their head. This means that you are in a situation where you can't do the things that are asked of you.
So if you told your boss you didn't know what you were doing in your job, they might say "It sounds like you're out of your depth – maybe this job isn't for you."
If your boss says that maybe you should go back to your old job, you might tell him that doing so would feel like "treading water." When a swimmer "treads water," they move their hands and feet just enough to keep their head above water but don't go anywhere. So "treading water" means to stay where you are and not make any progress.
So you could say to your boss "I don't want to tread water, please just give me some extra training."