tell on

US /tel ɑːn/
UK /tel ɑːn/
"tell on" picture
1.

dénoncer, rapporter

to inform an authority figure about someone's bad behavior

:
If you don't stop, I'm going to tell on you.
Si tu n'arrêtes pas, je vais te dénoncer.
The little boy decided not to tell on his sister.
Le petit garçon a décidé de ne pas dénoncer sa sœur.