Definition of 'spy'
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- (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
- a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night"
- catch sight of
Synonyms: descry spot espy
- watch, observe, or inquire secretly
Synonyms: stag snoop sleuth
- secretly collect sensitive or classified information; engage in espionage; "spy for the Russians"