(chiefly US, idiomatic) During the period of time when one is in a position of authority or responsibility.

(nautical) The practice of having two alternate watches aboard a ship or vessel.

Alternative spelling of watch cap

A knitted cap, such as the one worn by a seaman when on watch.

Alternative spelling of birdwatching

plural of pocket watch

A watch carried in the pocket, often with a closing cover and usually attached to a chain.

The act of watching for the occurrence of fires, for example during wartime bombing raids or in forested areas in hot and dry conditions.

A watch kept on some premises, or on a town, by guards during the night. / One or more of the guards on such a watch.

Used to warn someone of an imminent danger.