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

plain-clothes

adjective
 
/ˌpleɪn ˈkləʊðz/,
 
/ˌpleɪn ˈkləʊz/
 
/ˌpleɪn ˈkləʊðz/,
 
/ˌpleɪn ˈkləʊz/
[only before noun]
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  1. (of police officers on duty) wearing ordinary clothes, not uniform
    • plain-clothes police officers
    Topics Law and justicec2

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