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
cross out (something) or cross (something) out
to eliminate something by drawing a line through it
I crossed out my name from the list of volunteers.