To search narrowly; to scrutinize.
To act as a spy.
To explore; to see; to view; inspect and examine secretly, as a country.
To spot; to catch sight of.
A defensive player assigned to cover an offensive backfield player man-to-man when they are expected to engage in a running play, but the offensive player does not run with the ball immediately.
A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage).
To influence in some way by looking fixedly.
To look fixedly (at something).
To be very conspicuous on account of size, prominence, colour, or brilliancy.
A persistent gaze.