Meaning of “tell on someone” in the English Dictionary

american-english dictionary

"tell on someone" in American English

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tell on someone

infml
phrasal verb with tell us /tel/ verb past tense and past participle told /toʊld/

to give information about someone's bad behavior or secrets:

If you don’t stop hitting, I’m going to tell on you.

(Definition of “tell on someone” from the Cambridge Academic Content Dictionary © Cambridge University Press)