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

(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.

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

Alternative form of watchnight

Alternative form of watchnight.

Alternative spelling of watchtower

Alternative form of pocket watch

(idiomatic) An indication that a development will follow.

Alternative spelling of watchlist

(nautical) The middle watch on a ship, from midnight to 4 am.