A hobby concerned with the observation and study of butterflies.

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

(idiomatic) To guard and protect.

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.

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

continually looking at the time to see how much longer one has to work or study

A watch that displays time by means of a dial and hands, in contradistinction to a digital watch.

(idiomatic) To be aware or conscious; to look closely or carefully; to use caution. Often used in the imperative.

Used to warn someone of an imminent danger.

A watch, usually electronic, that displays time in the form of numbers, rather than by a dial and hands.