Watch

noun

1. A portable or wearable timepiece.

   "More people today carry a watch on their wrists than in their pockets."

2. The act of guarding and observing someone or something.
3. A particular time period when guarding is kept.

   "The second watch of the night began at midnight."

4. A person or group of people who guard.

   "The watch stopped the travelers at the city gates."

5. The post or office of a watchman; also, the place where a watchman is posted, or where a guard is kept.