Drop somebody in it - Idioms by The Free Dictionary
drop somebody in it
drop (one) in it
To embarrass one, often by revealing unflattering information. Primarily heard in UK. When Paul told the boss about my role in the printing mishap, he really dropped me in it.
drop somebody ˈin it (British English, informal) put somebody in an embarrassing situation, especially by telling a secret that you should not have told: Don’t mention Paul to my parents or you’ll really drop me in it — I haven’t told them about him yet. OPPOSITE: get somebody off the hook