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Verb: spy  spI
  1. Watch, observe, or inquire secretly
    - stag, snoop, sleuth
     
  2. Catch sight of; to perceive with the eyes
    "he caught spy of the king's men coming over the ridge";
    - sight, descry, spot, espy
     
  3. Secretly collect sensitive or classified information; engage in espionage
    "spy for the Russians"
Noun: spy  spI
  1. (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
    - undercover agent
     
  2. A secret watcher; someone who secretly watches other people
    "my spies tell me that you had a good time last night"
     
  3. A person secretly employed in espionage for a government
    - secret agent, intelligence officer, intelligence agent, operative, spook

Derived forms: spied, spies, spying

Type of: agent, comprehend, enquire [Brit, Cdn], inquire, investigate, looker, monitor, perceive, spectator, supervise, viewer, watcher, witness

Encyclopedia: Spy, Counterspy