undercover agent

Từ điển WordNet v3.1 - WordNet Dictionary

noun

(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
• Syn:
spy
• Derivationally related forms:
spy (for: spy)
• Topics:
military, armed forces, armed services, military machine, war machine
• Hypernyms:
secret agent, intelligence officer, intelligence agent, operative
• Hyponyms:
counterspy, mole, double agent, espionage agent, foreign agent,
infiltrator, sleeper
• Instance Hyponyms:
Mata Hari, Margarete Gertrud Zelle