Watch

a small portable timepiece

a period of time (4 or 2 hours) during which some of a ship's crew are on duty

a purposeful surveillance to guard or observe

the period during which someone (especially a guard) is on duty

a person employed to keep watch for some anticipated event

the rite of staying awake for devotional purposes (especially on the eve of a religious festival)

look attentively

follow with the eyes or the mind

see or watch

observe with attention

be vigilant, be on the lookout or be careful

observe or determine by looking

find out, learn, or determine with certainty, usually by making an inquiry or other effort