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

Alternative form of watchnight

(chemistry) An item of glass laboratory equipment consisting of a simple, slightly concave circle of glass. It is a general utility item, used to hold small samples, to evaporate liquids, to cover a beaker, and so on.

A period of monitoring of someone, especially a prisoner deemed likely to commit suicide, to ensure they do not attempt suicide.

Alternative form of watchnight.

(idiomatic) To guard and protect.

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

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

Alternative spelling of birdwatching

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.