卧底 Traditional 臥底 wò dǐ 🔊 to hide (as an undercover agent) + Review this word Meanings wò dǐ 臥底 to hide (as an undercover agent)an insider (in a gang of thieves)a mole Its characters 卧wòto lieHSK 7–9底dǐbottom; baseHSK 4