Meaning of “out of your depth” in the English Dictionary

british dictionary

"out of your depth" in British English

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out of your depth

C2 not having the knowledge, experience, or skills to deal with a particular subject or situation:

I was out of my depth in the advanced class, so I moved to the intermediate class.

in water that is so deep that it goes over your head when you are standing:

I'm not a strong swimmer, so I prefer not to go out of my depth.

(Definition of “out of your depth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)