on case

(redirected from keep on someone's case)

*on someone's case

 and *on someone's back
Inf. harassing someone about a personal problem; annoying someone. (*Typically: be ~; get ~; keep ~.) I'll get on Tom's case about being late so much. I'm sorry, I won't get on your case anymore.
See also: case, on

on (someone's) case

Persistently nagging or urging someone to do something.
See also: case, on