rat on

rat on (one)

To inform an authority figure of one's bad or illegal behavior. I can't believe you ratted on me like that to mom and dad—I'm never telling you anything ever again! The criminal ratted on his accomplices to avoid jail time.
See also: on, rat

rat on someone

Inf. to report someone's bad behavior to someone in authority; to tattle on someone. John ratted on me, and I got in trouble. If he rats on me, I'll hit him!
See also: on, rat

rat on

Betray a comrade by giving information, as in He ratted on his best friend to the police. [Slang; early 1900s]
See also: on, rat

rat on

v.
To disclose incriminating information about someone; betray someone by giving incriminating information: The hoodlum ratted on the rest of the gangsters. It was mean of you to rat on your friends.
See also: on, rat
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