A guard or a person assigned to keep watch.

पहरेदार

English Usage: The patrolling sentry kept a watchful eye on the perimeter.

Hindi Usage: पहरेदार ने परिधि पर निगरानी बनाए रखी।

To walk through an area to monitor or guard it.

गश्त करना

English Usage: The soldiers were patrolling the area to ensure safety.

Hindi Usage: सैनिक क्षेत्र की सुरक्षा सुनिश्चित करने के लिए गश्त कर रहे थे।