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Difference between Do a number and Do one’s number

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.