American English

Definition of rat on phrasal verb from the Oxford Advanced American Dictionary

 

rat on

 phrasal verb
phrasal verb
 
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Phrasal Verbs

rat on somebody

(also rat somebodyout (to somebody)) (informal) (disapproving)
 
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to tell someone in authority about something wrong that someone else has done Where I come from, you don't rat on your friends. Someone ratted us out to the police. The college was ratting out students for music piracy.
See the Oxford Advanced Learner's Dictionary entry: rat on