do a number on someone
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!
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.
do a number on someoneINFORMAL
If someone does a number on you, they harm you in some way, for example by cheating you or by totally defeating you in a game or match. He really did a number on me. I don't think I'll ever be able to trust him again. The Irish team are looking to do a number on England in Dublin tomorrow.
do a number on someoneand do a job on someone (From do a number on something.)
tv. to harm or deceive someone. The prof did a number on me because of my term paper. My local friendly plumber did a job on me cleaning out my drain.