wò​dǐ

mole

卧底 (臥底) wò​dǐ
mole noun
an undercover agent or an insider working within a group

The undercover agent successfully infiltrated the gang and obtained key criminal evidence.

go undercover verb
to hide or work as an undercover agent

The police sent him to go undercover in that criminal gang.

Frequency

Movie subtitles
17.3 per million appears in 4% of films
Written text
3.08 per million

Sources

Definitions
CC-CEDICT