The noun spy has 2 senses (first 1 from tagged texts)
1. (3) spy, undercover agent -- ((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. spy -- (a secret watcher; someone who secretly watches other people; "my spies tell me that you had a good time last night")
Overview of verb spy
The verb spy has 3 senses (first 2 from tagged texts)