plain clothes
noun/ˌpleɪn ˈkləʊðz/, /ˌpleɪn ˈkləʊz/
/ˌpleɪn ˈkləʊðz/, /ˌpleɪn ˈkləʊz/
[plural]- 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
- officers in plain clothes
Wordfinder
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