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spynoun agent, detective, emissarius, explorator, informer, intelligence agent, intelligencer, lookout, observer, reconnoiterer, reporter, scout, seeret agent, sleuth, snoop, snooper, source, speculator, undercover agent, undercover man, watcher
Associated concepts: espionage
spyverb behold, catch sight of, descry, detect, discover, discover by artifice, distinguish, eavesdrop, espy, examine secretely, follow, glimpse, innpect secretely, look at, look for, make a reconnaissance, make out, make secret observations, observe, peep, peer, perceive, pry, recognize, reconnoiter, scrutinize, search out, see, shadow, sight, snoop, speculari, spy upon, take note, trail, view, watch, watch secretely
See also: conspirator, discern, informant, observe, perceive, recognize, watch
SPY. One who goes into a place for the purpose of ascertaining the best way
of doing an injury there.
2. The term is mostly applied to an enemy who comes into the camp for the purpose of ascertaining its situation in order to make an attack upon it. The punishment for, this crime is death. See Articles of War, 1 Story's Laws U. S. 992; Vattel, Droit des Gens. liv. 3, Sec. 179.