· (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
Synonym(s): undercover_agent
Hypernym(s): secret_agent, intelligence_officer, intelligence_agent, operative
· a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night"
Hypernym(s): spectator, witness, viewer, watcher, looker
· catch sight of
Synonym(s): descry, spot, espy
· watch, observe, or inquire secretly
Synonym(s): stag, snoop, sleuth
Hypernym(s): monitor, supervise
· catch sight of; to perceive with the eyes; "he caught sight of the king's men coming over the ridge"
Synonym(s): sight
Hypernym(s): perceive, comprehend
· secretly collect sensitive or classified information; engage in espionage; "spy for the Russians"
Hypernym(s): investigate, inquire, enquire