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Definition of 'spy'

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  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
       Synonyms: undercover agent
  2. a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night"


  1. catch sight of
       Synonyms: descry spot espy
  2. watch, observe, or inquire secretly
       Synonyms: stag snoop sleuth
  3. secretly collect sensitive or classified information; engage in espionage; "spy for the Russians"

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