v. , slang 1. To ruin; destroy. Mr. Smith's business was done in by a fire that burned down his store. 2a. To kill; murder. The poor man was done in by two gangsters who ran away after the crime. 2b. To make tired; exhaust. The boys were done in after their long hike.
Synonym: WEAR OUT 2 . 3. To cheat; swindle. Mr. Jones was done in by two men who claimed to be collecting money for orphans and widows.