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 watch a location and/or people, generally covertly.
To mark off the limits by stakes
To end the game by hitting the stake peg in the middle of the court.