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Phrase(s): *in over one’s head (with someone or something)
1. Lit. in water that is deeper than one is tall. (*Typically: be ~; get ~.) • Johnny! Don’t go out too far! You are in over your head. 2. Fig. too deeply involved with someone or something, beyond what one can deal with. (*Typically: be ~; get ~.) • They are all in over their heads with this money business. 3. Fig. having more difficulties than one can manage. • Calculus is very hard for me. I’m in over my head.
McGrawhill's American Idioms And Phrasal Verbs