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."