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English definition of “patrol”

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patrol

verb [I or T] uk   /pəˈtrəʊl/ us    /-ˈtroʊl/ (-ll-)
(especially of soldiers or the police) to go around an area or a building to see if there is any trouble or danger: The whole town is patrolled by police because of the possibility of riots. A security guard with a dog patrols the building site at night. Coastguards found a deserted boat while patrolling (along) the coast.

patrol

noun uk   /pəˈtrəʊl/ us    /-ˈtroʊl/

patrol noun (CHECKING)

[C or U] the act of checking that there is no trouble or danger in a building or area: a highway patrol Three reconnaissance aircraft are permanently on patrol.

patrol noun (GROUP)

[C, + sing/pl verb] a small group of soldiers or military ships, aircraft, or vehicles, especially one that patrols an area: Our forward patrol has/have spotted the enemy.
(Definition of patrol from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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