Definition of "Watch" :

noun: a purposeful surveillance to guard or observe

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

noun: a small portable timepiece

noun: a person employed to keep watch for some anticipated event

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

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

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

verb: observe with attention

"They watched as the murderer was executed."

verb: observe or determine by looking

"Watch how the dog chases the cats away."

verb: look attentively

"Watch a basketball game."

verb: see or watch

verb: be vigilant, be on the lookout or be careful

"Watch out for pickpockets!."

verb: follow with the eyes or the mind

"The world is watching Sarajevo."