rat out
phrasal verbrat somebody out (to somebody) (especially North American English)
(also rat on somebody British and North American English)
(informal, disapproving)- to tell somebody in authority about something wrong that somebody else has done
泄露秘密；告密 - Someone ratted us out to the police.
有人向警方告发了我们。 - The college was ratting out students for music piracy.
该学院因音乐盗版而开除学生。
- Someone ratted us out to the police.