To gain sight of; to discover at a distance, or in a state of concealment; to espy; to see.
To discover by close search or examination.
To explore; to view; inspect; and examine secretly, as a country; -- usually with out.
To search narrowly; to scrutinize.
One who keeps a constant watch of the conduct of others.
A person sent secretly into an enemy's camp, territory, or fortifications, to inspect his works, ascertain his strength, movements, or designs, and to communicate such intelligence to the proper officer.
My father was sleepless most of his life. So by the age of five, I was awake with him all night long, watching bad television or we'd lie in the same bed, and I'd read my comic books while he read his latest spy or mystery novel. Sherman Alexie
The great advantage of being a writer is that you can spy on people. You're there, listening to every word, but part of you is observing. Everything is useful to a writer, you see - every scrap, even the longest and most boring of luncheon parties. Graham Greene
The role of women has always been undervalued in the spy world, always undermined in terms of recognition. Unfairly so. It's a world that needs women. Helen Mirren
The director of the FBI has been visiting Silicon Valley companies asking them to build back doors so that it can spy on what is being said online. The Department of Commerce is going after piracy. At home, the American government wants anything but Internet freedom. Evgeny Morozov
Setting people to spy on one another is not the way to protect freedom. Tommy Douglas