spy

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spy

noun 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

spy

verb 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.

References in classic literature ?
And I perhaps am secret; Heav'n is high, High and remote to see from thence distinct Each thing on Earth; and other care perhaps May have diverted from continual watch Our great Forbidder, safe with all his Spies About him.
Having local spies means employing the services of the inhabitants of a district.
Having inward spies, making use of officials of the enemy.
Having converted spies, getting hold of the enemy's spies and using them for our own purposes.
Having doomed spies, doing certain things openly for purposes of deception, and allowing our spies to know of them and report them to the enemy.
Convinced that they were spies sent on some sinister errand, they took them in custody, and set to work to drive in the horses.
The robbers, who soon found that their spies were in captivity, now made their appearance on horseback, and held a parley.
Of all that mighty host, none but the two faithful spies ever lived to set their feet in the Promised Land.
You are a spy and spies must die if they are caught.
There are no spies, anyhow, hiding in the tress of Berkeley Street," he added, glancing about them.
My surmises did not for a moment class a man of the Count's abilities and social position with the ordinary rank and file of foreign spies.
Thirdly, the existence of these spies amongst the revolutionary groups, which we are reproached for harbouring here, does away with all certitude.