Synonyms: spy, undercover agent
Definition: (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
Similar words: operative, intelligence agent, intelligence officer, secret agent
Definition: a person secretly employed in espionage for a government
Synonyms: spy
Definition: a secret watcher; someone who secretly watches other people
Usage: my spies tell me that you had a good time last night
Similar words: spectator, looker, witness, watcher, viewer
Definition: a close observer; someone who looks at something (such as an exhibition of some kind)
Usage: the spectators applauded the performance; television viewers; sky watchers discovered a new star
Synonyms: spy
Definition: secretly collect sensitive or classified information; engage in espionage
Usage: spy for the Russians
Similar words: inquire, enquire, investigate
Definition: conduct an inquiry or investigation of
Usage: The district attorney's office investigated reports of possible irregularities; inquire into the disappearance of the rich old lady
Synonyms: spy, stag, sleuth, snoop
Definition: watch, observe, or inquire secretly
Similar words: monitor, supervise
Definition: keep tabs on; keep an eye on; keep under surveillance
Usage: we are monitoring the air quality; the police monitor the suspect's moves
Synonyms: descry, spot, spy, espy
Definition: catch sight of
Definition: catch sight of; to perceive with the eyes
Usage: he caught sight of the king's men coming over the ridge
Definition: catch sight of; to perceive with the eyes
Usage: he caught sight of the king's men coming over the ridge
Similar words: comprehend, perceive
Definition: to become aware of through the senses
Usage: I could perceive the ship coming over the horizon