watch
/wɒt͡ʃ/
A portable or wearable timepiece.
More people today carry a watch on their wrists than in their pockets.
The act of guarding and observing someone or something.
A particular time period when guarding is kept.
The second watch of the night began at midnight.
A person or group of people who guard.
The watch stopped the travelers at the city gates.
The post or office of a watchman; also, the place where a watchman is posted, or where a guard is kept.
A group of sailors and officers aboard a ship or shore station with a common period of duty: starboard watch, port watch.
A period of time on duty, usually four hours in length; the officers and crew who tend the working of a vessel during the same watch. (FM 55–501).
The act of seeing, or viewing, for a period of time.