#1 spy n. [undercover agent] (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors. wn
#2 spy v. [descry, spot, espy] catch sight of. wn
#3 spy v. [stag, snoop, sleuth] watch, observe, or inquire secretly. wn
#4 spy n. a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night". wn
#5 spy v. [sight] catch sight of; to perceive with the eyes; "he caught sight of the king's men coming over the ridge". wn
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