n.
1.(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.a secret watcher spy v.
1.catch sight of
2.watch, observe, or inquire secretly
3.secretly collect sensitive or classified information
Idiom of the Day
go out the window
to be abandoned, to go out of effect
The school dress code went out the window when the new principal arrived.