Definition: spy

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Source: WordNet (r) 1.7

spy
     n 1: a secret agent hired by a state to obtain (military)
          information about its enemies or by a business to obtain
          industrial secrets from competitors [syn: undercover
          agent]
     2: a secret watcher; someone who secretly watches other people;
        "my spies tell me that you had a good time last night"
     v 1: catch sight of [syn: descry, spot, espy]
     2: watch, observe, or inquire secretly [syn: stag, snoop, sleuth]
     3: secretly collect sensitive or classified information; engage
        in espionage; "spy for the Russians"

Source: Webster's Revised Unabridged Dictionary (1913)

Spy \Spy\, v. i.
   To search narrowly; to scrutinize.

         It is my nature's plague To spy into abuses. --Shak.
Spy \Spy\, v. t. [imp. & p. p. Spied; p. pr. & vb. n.
   Spying.] [OE. spien, espien, OF. espier, F. ['e]pier, OHG.
   speh?n, G. sp["a]hen; akin to L. specere to see, Skr. spa(?).
   ? 169. Cf. Espy, v.t., Aspect, Auspice, Circumspect,
   Conspicuouc, Despise, Frontispiece, Inspect,
   Prospect, Respite, Scope, Scecimen, Spectacle,
   Specter, Speculate, Spice, Spite, Suspicion.]
   To gain sight of; to discover at a distance, or in a state of
   concealment; to espy; to see.

         One in reading, skipped over all sentences where he
         spied a note of admiration.              --Swift.

   2. To discover by close search or examination.

            Look about with yout eyes; spy what things are to be
            reformed in the church of England.    --Latimer.

   3. To explore; to view; inspect; and examine secretly, as a
      country; -- usually with out.

            Moses sent to spy Jaazer, and they took the villages
            thereof.                              --Num. xxi.
                                                  32.
Spy \Spy\, n.; pl. Spies. [See Spy, v., and cf. Espy, n.]
   1. One who keeps a constant watch of the conduct of others.
      ``These wretched spies of wit.'' --Dryden.

   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.