臥底

卧底
  1. to hide (as an undercover agent)
  2. an insider (in a gang of thieves)
  3. a mole

CEDICT

  1. to work undercover; to engage in clandestine intelligence gathering; to act as a planted agent
  2. undercover agent; mole; plant; insider

Wiktionary

潛伏敵方打探消息準備內應

重編國語辭典

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