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English definition of “plain clothes”

plain clothes

noun [plural] uk   us  
ordinary clothes when worn by police when they are working: There were police in plain clothes in the crowd.Clothes worn for a particular job or activityThe police generally
plain-clothes
adjective [before noun] uk   /ˌpleɪnˈkləʊðz/ us    /-ˈkloʊðz/
plain-clothes police officers/detectivesClothes worn for a particular job or activityThe police generally
(Definition of plain clothes from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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