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 (synset 110661153)
  2. A secret watcher;
    Someone who secretly watches other people (synset 110661549)
    "my spies tell me that you had a good time last night"
  1. Catch sight of (synset 202158742)
  2. Watch, observe, or inquire secretly (synset 200787352)
  3. Catch sight of;
    To perceive with the eyes (synset 202168177)
    "he caught sight of the king's men coming over the ridge"
  4. Secretly collect sensitive or classified information;
    Engage in espionage (synset 200787132)
    "spy for the Russians"

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