Rat on

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Negative Connotation

Using 'rat on' suggests disapproval of the informant, as it's often seen as a betrayal.

Even with the evidence piling up, she refused to rat on her friend.

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Slang Usage

It's casual slang, not suitable in formal contexts like business meetings or academic writing.

I couldn't believe he would actually rat on me to the teacher.

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Criminal Context

Often used in the context of crime, where someone reports illegal activities to the authorities.

After being caught, the thief decided to rat on his accomplices.