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Definition of plain clothes noun from the Oxford Advanced Learner's Dictionary

plain clothes

noun
 
/ˌpleɪn ˈkləʊðz/,
 
/ˌpleɪn ˈkləʊz/
 
/ˌpleɪn ˈkləʊðz/,
 
/ˌpleɪn ˈkləʊz/
[plural]
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  1. ordinary clothes, not uniform, when worn by police officers on duty
    • officers in plain clothes
    Topics Law and justicec2
See plain clothes in the Oxford Advanced American Dictionary

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