1. Seriously involved; far advanced. For example, He was in deep with the other merchants and couldn't strike out on his own, or She used her credit cards for everything, and before long she was in deep. 2.

Were in too deep meaning?

informal. : in a difficult situation that one cannot get out of He wanted to get out of the deal, but he was in too deep.

What does it mean to say something is deep?

(dip ) Word forms: deeper, deepest. adjective. If something is deep, it extends a long way down from the ground or from the top surface of something.