do a number—
1. (Underworld) give information to the police:
- If Keiser’s doing a number, I’ve arranged for you to knock him off.
2. (euph., of an animal) urinate or defecate:
- That black puppy did a number on the carpet again.
do one’s number—
1. perform one’s act in a program of entertainment, etc.:
- When I got up to do my number my sound was terrible….
2. (sl.) behave in a predictable or customary manner:
- Whenever I call, he does his number about being too busy to talk.