do a number on (someone or something)
1. To hurt or harm someone or something. Considering her pessimism toward marriage, her last break-up must have really done a number on her. Ugh, your puppy did a number on my new shoes—they're completely chewed up! I guess I really did a number on my computer because IT couldn't even fix it.
2. To urinate or defecate on something. My cat used to always use her litter box, but she regularly does a number on the floor, unfortunately. Roll up the rugs so the kids don't do a number on them while you're potty training. Looks—and smells—like somebody did a job on his dog bed. Guess I'm cleaning that up!
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.