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(警察执行任务时穿的)便衣,便服
    • officers in plain clothes便衣警察
    Topics Law and justicec2