rat on (one)

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
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

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
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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
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.

rat (on someone)

in. to inform (on someone). Bill said he was going to rat on that punk.
See also: on, rat, someone
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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