Etymology
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spy (v.)

mid-13c., "to watch stealthily," from Old French espiier "observe, watch closely, spy on, find out," probably from Frankish *spehon or some other Germanic source, from Proto-Germanic *spehon- (source also of Old High German *spehon "to look out for, scout, spy," German spähen "to spy," Middle Dutch spien), the Germanic survivals of the productive PIE root *spek- "to observe." Old English had spyrian "make a track, go, pursue; ask about, investigate," also a noun spyrigend "investigator, inquirer." Italian spiare, Spanish espiar also are Germanic loan-words. Meaning "to catch sight of" is from c. 1300. Children's game I spy so called by 1946.

spy (n.)

mid-13c., "one who spies on another," from Old French espie "spy, look-out, scout" (Modern French épie), probably from a Germanic source related to spy (v.).

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Definitions of spy
1
spy (v.)
catch sight of;
Synonyms: descry / spot / espy
spy (v.)
watch, observe, or inquire secretly;
Synonyms: stag / snoop / sleuth
spy (v.)
catch sight of; to perceive with the eyes;
Synonyms: sight
spy (v.)
secretly collect sensitive or classified information; engage in espionage;
spy for the Russians
2
spy (n.)
(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
spy (n.)
a secret watcher; someone who secretly watches other people;
From wordnet.princeton.edu