spy meaning and definition

SPY noun

Definition of spy (noun)

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"

SPY verb

Definition of spy (verb)

1. catch sight of
   • synonyms: descry, espy, spot
2. watch, observe, or inquire secretly
   • synonyms: sleuth, snoop, stag
3. catch sight of; to perceive with the eyes
   • "he caught sight of the king's men coming over the ridge"
   • synonyms: sight
4. secretly collect sensitive or classified information; engage in espionage
   • "spy for the Russians"