do a number on something

do a ˈnumber on somebody/something

(informal, especially American English) hurt, damage or criticize somebody/something seriously: Sun and pollution can really do a number on your skin.To the delight of Republicans, the press did a number on your senator (= criticized him severely).

do a number on something

1. tv. to urinate or defecate on something. Billy did a number on the bathroom floor.
2. tv. to damage or ruin something; to destroy something. The truck really did a number on my car.
See also: number, on, something