patrol noun

ADJ. routine | special | armed | foot Every police car and foot patrol in the area is on full alert. | dawn, night | air, army, military, naval, police, security | enemy | border, shore | traffic helicopters used for traffic patrols

VERB + PATROL carry out, fly, go on The Italians flew regular patrols over the desert. | maintain Britain can maintain a continuous patrol of the seas with only three submarines. | send out They sent out four-man patrols to scout the area.

PATROL + NOUN boat, car, vehicle | duty

PREP. (out) on ~ police officers on patrol