tell on

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

고자질하다, 일러바치다

to inform an authority figure about someone's bad behavior

:
If you don't stop, I'm going to tell on you.
그만두지 않으면, 고자질할 거야.
The little boy decided not to tell on his sister.
어린 소년은 누나를 고자질하지 않기로 결정했다.