Meaning of “knee-deep” - Learner’s Dictionary

knee-deep

adjective uk us /ˌniːˈdiːp/

reaching as high as someone's knees:

knee-deep in cold water
be knee-deep in sth

to have a lot of something to deal with:

I'm knee-deep in paperwork.

(Definition of “knee-deep” from the Cambridge Learner’s Dictionary © Cambridge University Press)