spy

[ spahy ]
/ spaɪ /

noun, plural spies.

verb (used without object), spied, spy·ing.

verb (used with object), spied, spy·ing.

Origin of spy

1200–50; (v.) Middle English spien, aphetic variant of espien to espy; (noun) Middle English, aphetic variant of espy a spy < Old French espie

OTHER WORDS FROM spy

British Dictionary definitions for spy on

spy
/ (spaɪ) /

noun plural spies

a person employed by a state or institution to obtain secret information from rival countries, organizations, companies, etc
a person who keeps secret watch on others
obsolete a close view

verb spies, spying or spied

(intr usually foll by on) to keep a secret or furtive watch (on)
(intr) to engage in espionage
(tr) to catch sight of; descry

Word Origin for spy

C13 spien, from Old French espier, of Germanic origin; related to Old High German spehōn, Middle Dutch spien

Idioms and Phrases with spy on

spy on

Secretly or furtively observe someone or something, as in The children loved spying on the grownups, or The company sent him to spy on the competitor's sales force. [Early 1600s]