rat on
US /ræt ɑːn/
UK /ræt ɑːn/
1.
донести на, настучать на
to inform on someone, especially to an authority
:
•
He threatened to rat on his friends if they didn't help him.
Он угрожал донести на своих друзей, если они ему не помогут.
•
She decided not to rat on her brother, even though he broke the rules.
Она решила не доносить на своего брата, хотя он нарушил правила.