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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31) The spy wormed in the meeting-place.
32) He was later discovered to have been a spy.
33) The police detected a spy.
34) His assignment was to follow the spy.
35) I spy someone coming up the garden path.
36) She had always wanted to write a spy thriller.
37) They made several ham-fisted attempts to spy on her.
38) The spy doesn't know we have him pegged.
39) The organization had been penetrated by a spy.
40) She sent you to spy on me,(sentencedict.com/spy.html) didn't she?
41) We must assume that the spy kept the negatives.
42) Once they had ascertained that he was not a spy, they agreed to release him.
43) The spy was caught by a policewoman who posed as a prostitute.
44) It is said that he was a spy during the war.
45) When they discovered he was a spy, he became a marked man.
46) Her book is a hilarious send - up of a conventional spy story.
47) Elliott unmasked and confronted the master spy and traitor Kim Philby.
48) The gunners took aim at the enemy spy plane and brought it down.
49) The spy returned to deliver a second batch of classified documents.
50) I generally like to spy out restaurants before I go to eat in them.
51) The spy never told his family about his underground activities.
52) The spy insinuated himself into the confidence of important officers.
53) I was ordered to spy on the information of a firm.
54) As new facts became known, the Government was forced to climb down over its handling of the spy scandal.
55) He feared the ignominy of being exposed as a spy.
56) The young man looked embarrassed, as if he were a spy whose cover had been blown.
57) We drove around the area where our new house is to spy out the land.
58) The man was accused of being a spy in the pay of the enemy.
59) The British spy, Kim Philby, defected to the Soviet Union/defected from Britain in 1963.
60) Spy thrillers with plots based on the Cold War look particularly dated nowadays.