1.  inform against sb .
2.  give secret information against sb .

• 1. 告密: snitch
• 2. 告密者: The Informant | The Informer | The Whistleblower
• 3. 告密的心: The Tell-Tale Heart

更多释义

• 1.是什么为告密者提供匿名性？
  What provides anonymity for the whistleblower?
  dict.yoduao.com
• 2.一定有人向警方告密了。
  Someone must have blabbed to the police.
  dict.yoduao.com
• 3.你这家伙就爱告密！以后我什么话都不跟你说了！
  You little snitch! I'll never tell you anything again!
  dict.yoduao.com

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