To look and wait expectantly or in anticipation, To stay awake at night while serving as a guard, sentinel, or watcher, To guard, keep surveillance on, or spy on, noun_ The period of time during which one person or body of persons watch or stand sentinel, or the time from one relief of sentinels to another; hence, a division of the night, when the precautionary setting of a watch is most generally necessary; period of time; hour, The state of being awake; wake-fulness, The members of a ship's crew on duty during a specific watch