2. The police found a spy following him. 警察们跟踪他抓了一个特务。
3. A:I spy something big. 我发现了一个大家伙。
1. (military) a secret agent hired by a state to obtain information about its enemies or by a business
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