അർത്ഥം : (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors.
പര്യായപദങ്ങൾ : undercover agent
അർത്ഥം : A secret watcher. Someone who secretly watches other people.
ഉദാഹരണം :
My spies tell me that you had a good time last night.