A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage). (noun)
To act as a spy. (verb)
To spot at a distance. (verb)
Examples of word spy
And -- went on the cool, quiet mind -- since the man was _not_ a spy how could a Union officer be executed for assisting a _spy_ to escape?
The term spy ware refers to software programs made by unscrupulous marketing companies that allow them to snoop on your browsing activity, see what you purchase, and cause pop-up ads to appear on your computer.
Just as it looks like the spy is about to complete his mission and escape, he is gunned down by Major John Casey, an NSA agent who has encountered him before.
Some of his work might justify the word "spy" in Shulman's subtitle, though "assassin" is surely over-egging it.
And he is listening to what we call the spy in the sky.