1spy 
/ˈspaɪ/ noun
plural spies /ˈspaɪ/ noun [count] 1 : a person who tries secretly to get information about a country or organization for another country or organization
▪ He was a spy for the CIA. ▪ a Cold War spy — often used before another noun ▪ a spy novel/thriller [=a novel/thriller about spies] ▪ a spy camera/plane [=a camera/plane used for spying] 2 : someone who secretly watches the movement or actions of other people
▪ My coworker is a spy for the boss. ▪ the neighborhood spy
▪ He was a spy for the CIA. ▪ a Cold War spy — often used before another noun ▪ a spy novel/thriller [=a novel/thriller about spies] ▪ a spy camera/plane [=a camera/plane used for spying]
▪ My coworker is a spy for the boss. ▪ the neighborhood spy
