a period of time (4 or 2 hours) during which some of a ship's crew are on duty
the period during which someone (especially a guard) is on duty
To look at, see, or view for a period of time. observe with attention
- "They watched as the murderer was executed"
- "I'm tired of watching TV"
To observe something over a period of time; to notice or pay attention.
- "Watch what happens when you press the button"
To be wary or cautious of someone or something. be vigilant, be on the lookout, be on one's guard, be careful
- "Watch out for pickpockets!"