To notice or view, especially carefully or with attention to detail.
To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning).
To comment on something; to make an observation.
To follow or obey the custom, practice, or rules (especially of a religion).
To spot; to catch sight of.
To act as a spy.
To search narrowly; to scrutinize.
To explore; to see; to view; inspect and examine secretly, as a country.
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).