Taivo A Taiwan Mandarin dictionary

臥底

wòdǐ

ㄨㄛˋ ㄉㄧˇ

Simplified 卧底

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

Keep 臥底 and it comes back until you know it.

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