[ spahy ]
/ spaɪ /
noun, plural spies.
a person employed by a government to obtain secret information or intelligence about another, usually hostile, country, especially with reference to military or naval affairs.
a person who keeps close and secret watch on the actions and words of another or others.
a person who seeks to obtain confidential information about the activities, plans, methods, etc., of an organization or person, especially one who is employed for this purpose by a competitor: an industrial spy.
the act of spying.
verb (used without object), spied, spy·ing.
to observe secretively or furtively with hostile intent (often followed by on or upon).
to act as a spy; engage in espionage.
to be on the lookout; keep watch.
to search for or examine something closely or carefully.
verb (used with object), spied, spy·ing.
to catch sight of suddenly; espy; descry: to spy a rare bird overhead.
to discover or find out by observation or scrutiny (often followed by out).
to observe (a person, place, enemy, etc.) secretively or furtively with hostile intent.
to inspect or examine or to search or look for closely or carefully.
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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
spy·ship, nounout·spy, verb (used with object), out·spied, out·spy·ing.su·per·spy, noun, plural su·per·spies.un·spied, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for spy on
/ (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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Idioms and Phrases with 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]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.