spy (
http://definr.com/spy)
n 1: a secret agent hired by a state to obtain (military)
information about its enemies or by a business to obtain
industrial secrets from competitors [syn: {undercover
agent}]
2: a secret watcher; someone who secretly watches other people;
"my spies tell me that you had a good time last night"
v 1: catch sight of [syn:
descry,
spot,
espy]
2: watch, observe, or inquire secretly [syn:
stag,
snoop,
sleuth]
3: secretly collect sensitive or classified information; engage
in espionage; "spy for the Russians"