Also means
to tell tales
Usage Note
Cafter is school-yard and informal slang for telling on someone to an authority. The person who does it is a cafteur (m) or cafteuse (f). It is roughly equivalent to 'to grass' (British) or 'to tattle' (American). Strictly informal; avoid in formal writing.
Examples
"Il a cafté sur ses camarades de classe."
Natural Translation
He snitched on his classmates.

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