do in

verb5

1. •
   (informal) To kill or end; to defeat.

   • By the eighth mile, I was sure that finishing the 10-mile hike would do me in.
   • We very nearly did in an entire keg of beer that weekend.
2. •
   (informal) To exhaust, to tire out.

   • I’m off to bed. I’m completely done in.
   • I'm exhausted! That 20-mile hike has done me in.
3. •
   (informal) To damage or injure.

   • I’m off work at the moment; I’ve done my back in.
4. •
   (informal) To eat.

   • I can do in a dozen eggs.
5. •
   (slang, old-fashioned) To rob (someone); to steal or pilfer from (someone).