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Definition of patrol
a person or group of people sent to keep watch over an area, especially a detachment of guards or police:a police patrol stopped the man and searched him the action of keeping watch over an area by walking or driving around it at regular intervals:the policemen were on patrol when they were ordered to investigate the incident an expedition to carry out reconnaissance:we were ordered to investigate on a night patrol a routine operational voyage of a ship or aircraft:a submarine patrol a unit of six to eight Girl Scouts or Boy Scouts forming part of a troop.
verb (patrols, patrolling, patrolled) [with object]
keep watch over (an area) by regularly walking or traveling around or through it:the garrison had to patrol the streets to maintain order [no object]:pairs of men were patrolling on each side of the thoroughfare