臥底 wò dǐ

a mole; to hide (as an undercover agent)

Word data

HSK Not in HSK
Frequency Unknown

Definitions

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

Characters

Character Meaning
臥 wò
to lie; to crouch
底 dǐ HSK 4
bottom; base; end (of the month, year etc)