spy /spaɪ/noun 2verb 4forms 5phrases 2 noun2 •someone who finds out in secret what other people or groups are doing, to get an advantageThe dead leap at the throat, destroy The meaning of the day; dark forms Have scaled your walls, and spies betray Old secrets to amorphous swarms. — 1941 •A defensive player assigned to cover an offensive backfield player man-to-man when they are expected to engage in a running play, but the offensive player does not run with the ball immediately. verb4 •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; to espy.I think I can spy that hot guy coming over here. •To explore; to see; to view; inspect and examine secretly, as a country. •To search narrowly; to scrutinize.(As I confesse it is my Natures plague / To spy into Abuses, and of my iealousie / Shapes faults that are not) — 1603 formsspied · spying · spies · spieth · spiest Phrases with spy spy onTo watch secretly or covertly; to surveil. spy outTo sight or discover by spying.