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rat out

phrasal verb
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rat somebody out (to somebody) (especially North American English)
(also rat on somebody British and North American English)
(informal, disapproving)
  1. 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.这所大学正在招收学生以盗版音乐。