On the watch

What is On the watch?

On the watch definition and meaning on Dictionary terms:
verb (used without object)
to be alertly on the lookout, look attentively, or observe, as to see what comes, is done, or happens: to watch while an experiment is performed.
to look or wait attentively and expectantly (usually followed by for): to watch for a signal; to watch for an opportunity.

to be careful or cautious: Watch when you cross the street.
to keep awake, especially for a purpose; remain vigilant, as for protection or safekeeping: to watch with a sick person.
to keep vigil, as for devotional purposes.
to keep guard: She was assigned to watch at the door.

verb (used with object)
to keep under attentive view or observation, as in order to see or learn something; view attentively or with interest: to watch a play; to watch a football game.
to contemplate or regard mentally: to watch his progress.

to look or wait attentively and expectantly for: to watch one’s opportunity.
to guard, tend, or oversee, especially for protection or safekeeping: to watch the baby.

close, continuous observation for the purpose of seeing or discovering something: Their watch for the birds was unrewarding.
vigilant guard, as for protection or restraint: to keep watch for prowlers.

a keeping awake for some special purpose: a watch beside a sickbed.
a period of time for watching or keeping guard: to stand the first watch.
a small, portable timepiece, as a wrist watch or pocket watch.
a chronometer.
Nautical. a period of time, usually four hours, during which one part of a ship’s crew is on duty, taking turns with another part.the officers and crew who attend to the working of a ship for an allotted period of time.

one of the periods, usually three or four, into which the night was divided in ancient times, as by the Greeks or Hebrews: the fourth watch of the night.
a person or group that watches, as a lookout, guard, or sentinel: A watch was posted at sunset.
Also called storm watch. Meteorology. an announcement from the U.S. National Weather Service alerting the public that dangerous weather conditions are a possibility and that vigilance and precautionary preparations are advised: hurricane watch, tornado watch.Compare advisory(def 5), warning(def 3).
a flock of nightingales.


reference: www.dictionary.com/browse/on–the–watch