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English definition of “patrol”

patrol

noun [C or U] (CHECKING)    /pəˈtrəʊl/ US  /-ˈtroʊl/
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.The police generally
(Definition of patrol noun (CHECKING) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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