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on (one's) case
Constantly or frequently nagging, harassing, or annoying someone. My boss has been on my case all week to get that report done. I'm sorry for getting on your case about it, but I need an answer soon.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
*on someone's caseand *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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
on (someone's) case
Persistently nagging or urging someone to do something.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.