Tra từ undercover work - Từ điển WordNet v3.1

Từ điển WordNet v3.1 - WordNet Dictionary

undercover work

noun

the act of keeping a secret watch for intelligence purposes
• Syn:
spying
• Derivationally related forms:
spy (for: spying)
• Hypernyms:
intelligence, intelligence activity, intelligence operation
• Hyponyms:
espionage