Synonym: detect, discern, observe, see, sight, spot, view. Similar words: say, sec., any, bay, boy, buy, by, day. Meaning: [spaɪ] 
n. 1. (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors 2. a secret watcher; someone who secretly watches other people. v. 1. catch sight of 2. watch, observe, or inquire secretly 3. secretly collect sensitive or classified information; engage in espionage.
n. 1. (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors 2. a secret watcher; someone who secretly watches other people. v. 1. catch sight of 2. watch, observe, or inquire secretly 3. secretly collect sensitive or classified information; engage in espionage. 
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1) They expelled a foreign spy from their country.
2) I'm sure my neighbours spy on me.
3) I wonder if you are a spy.
4) Edwards confessed to being a spy for the KGB.
5) The spy whelmed his hat down over his eyes.
6) He denied acting as an enemy spy.
7) The spy stole secret government documents.
8) In the film,(http://sentencedict.com/spy.html) he plays a spy whose mission is to confirm the verity of a secret military document.
9) He plays a Russian spy in the comedy drama 'Sleepers'.
10) The spy wormed the true story out of a boy.
11) The spy dodged with the lady.
12) His former colleagues have denounced him as a spy.
13) She delated him to the police for a spy.
14) He worked as a British spy in Russia.
15) I never agreed to spy against the United States.
16) Secret files reveal an Oxford spy ring .
17) He was a spy for the government.
18) The spy was caught in the act.
19) He nakedized himself a spy.
20) Video spy cameras are being used in public places.
21) Counter-intelligence officers uncovered a spy ring involving twenty agents.
22) The man was accused of being a spy.
23) Can you shake that spy?
24) The police had planted a spy in the gang.
25) They have tracked down the spy.
26) A spy used cunning means to find out secrets.
27) "She thinks you're a spy," Scott said matter-of-factly.
28) The spy is onto us,we'd better hide.
29) This evidence reinforces my view that he is a spy.
30) He was jailed for five years as an alleged British spy.