inform on (one)
To share or reveal compromising or incriminating information about one, especially to the police or other figures of authority. If you inform on him to the cops, he'll definitely send some of his goons out after you. Yeah, I know about your shady deals, but I didn't inform on you, I swear!
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
inform someone on someone
to tattle (on someone) (to someone). I will inform the teacher on you! Billy informed his mother on Bobby.
inform on someone
to tell the authorities about someone; to tattle on someone. I am going to have to inform on you. Liz informed on Ken to their mother.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
inform onor inform against
To disclose confidential or incriminating evidence about someone to an authority: The FBI agent informed on the drug dealers. You can't force me to inform against my own family.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.