Spies
/spaɪz/
noun
A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage).
Synonyms: intelligencer
verb
To act as a spy.
“During the Cold War, Russia and America would each spy on each other for recon.”
To spot; to catch sight of.
“I think I can spy that hot guy coming over here.”
To search narrowly; to scrutinize.