noun
(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
noun
a secret watcher
Examples
- someone who secretly watches other people
- my spies tell me that you had a good time last night
verb
catch sight of
Synonyms
verb
watch, observe, or inquire secretly
Synonyms
verb
catch sight of
Synonyms
Examples
- to perceive with the eyes
- he caught sight of the king's men coming over the ridge
verb
secretly collect sensitive or classified information
Examples
- engage in espionage
- spy for the Russians