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1. To exhaust someone. A noun or pronoun can be used between "do" and "in." A full day of traveling has totally done me in. I know it's only five o'clock, but I'm ready for bed!
2. To cause someone or something's collapse or ruin, often through deception. A noun or pronoun can be used between "do" and "in." After he betrayed me, I vowed to do him in and steal all of his major clients. That traveling salesman sure did me in by running off with my money.
3. To kill someone or oneself. A noun or pronoun can be used between "do" and "in." I did in the informant, boss, don't worry—he'll never talk to the police again.
Exhausted and in need of rest. I'm done in after exams each year—I feel like I need to sleep for a few days afterward. Can you pick up the kids from soccer practice? I'm totally done in.
exhausted. (*Typically: be ~; get ~.) I'm really done in! I think I'll go to bed. After all that lifting, Gerald was done in and breathing hard.
Exhausted, very tired, as in After that hike I felt absolutely done in. [Colloquial; early 1900s] Also see done for, def. 1.
done inextremely tired. informal
1999 Chris Dolan Ascension Day Morag was too upset and Paris was too done in to try and work out what was happening.
done ˈin(informal) extremely tired: I feel absolutely done in! OPPOSITE: full of beans
Informal Totally worn out; exhausted.