What is the meaning of Watch?

A portable or wearable timepiece.

The act of guarding and observing someone or something.

A particular time period when guarding is kept.

A period of wakefulness between the two sleeps of a biphasic sleep pattern (the dead sleep or first sleep and morning sleep or second sleep): the first waking.

A person or group of people who guard.

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 55501).

The act of seeing, or viewing, for a period of time.

To look at, see, or view for a period of time.

To observe over a period of time; to notice or pay attention.

To mind, attend, or guard.

To be wary or cautious of.

To attend to dangers to or regarding.

To remain awake with a sick or dying person; to maintain a vigil.

To be vigilant or on one's guard.

To act as a lookout.

To serve the purpose of a watchman by floating properly in its place.

To be awake.

To be on the lookout for; to wait for expectantly.

Source: wiktionary.org