Spy, n.; pl. Spies
 1. One who keeps a constant watch of the conduct of others. “These wretched spies of wit.”
 2. Mil. A person sent secretly into an enemy's camp, territory, or fortifications, to inspect his works, ascertain his strength, movements, or designs, and to communicate such intelligence to the proper officer.
 Spy money, money paid to a spy; the reward for private or secret intelligence regarding the enemy.
 Spy Wednesday Eccl., the Wednesday immediately preceding the festival of Easter; -- so called in allusion to the betrayal of Christ by Judas Iscariot.
 Syn: -- See Emissary, and Scout.
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