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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211) Some describe the American spy plane missions along the Chinese coastline as in-your-face intelligence collection and an ostentatious display of power.
212) The nearly century-old red-brick structure and clocktower are where the film's patriotic students hatch their plan to assassinate a Japanese-allied Chinese spy.
213) There, they will spy boys in tight, pink jeans and girls with errant bum cheeks flopping loose from sawn-off denim shorts.
214) Markus saw some of the sea ice images last December when the committee reviewed the scientific value of the spy satellite data.
215) Eight of the 11 suspects in the spy ring were teams that prosecutors say were handpicked and put together as married couples to cozy up to American policymakers.