be on (one's) case
To be constantly nagging, harassing, or annoying someone. My boss has been on my case all week to get that report done. I'm sorry for being on your case about it, but I need an answer soon. Ugh, my mom is on my case all the time about my grades, but I just have no interest in the classes I'm taking this semester.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.