inform on


Also found in: Legal.

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.
See also: inform, on

inform someone on someone

to tattle (on someone) (to someone). I will inform the teacher on you! Billy informed his mother on Bobby.
See also: inform, on

inform on

or inform against
v.
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.
See also: inform, on