do someone in

do in

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.

do someone in

1. tv. to make someone tired. That tennis game really did me in.
2. tv. to cheat someone; to take someone in. The scam artists did the widow in by talking her into giving them all the money in her bank account.
3. tv. to kill someone. The crooks did the bank guard in.
See also: someone