A guard or sentinel

चौकीदार

English Usage: The sentry stood watch at the gate.

Hindi Usage: चौकीदार दरवाजे पर पहरा दे रहा था।

To move from one place to another

To function or be in operation

चलाना

English Usage: The engine will go smoothly after the repairs.

Hindi Usage: मरम्मत के बाद इंजन अच्छी तरह चलेगा।