spying

Noun
  1. Keeping a secret or furtive watch (synset 100883119)
    is a type of: vigil, watch - a purposeful surveillance to guard or observe
  2. The act of keeping a secret watch for intelligence purposes (synset 100655477)
    is a type of: intelligence, intelligence activity, intelligence operation - the operation of gathering information about an enemy
    subtypes: espionage - the systematic use of spies to get military or political secrets
    same as: undercover work
  3. The act of detecting something;
    Catching sight of something (synset 100151907)
    is a type of: discovery, find, uncovering - the act of discovering something
    same as: catching, detection, espial, spotting

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