plain clothes
noun/ˌpleɪn ˈkləʊðz/, /ˌpleɪn ˈkləʊz/
/ˌpleɪn ˈkləʊðz/, /ˌpleɪn ˈkləʊz/
[plural]- ordinary clothes, not uniform, when worn by police officers on duty
- officers in plain clothes
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plain clothes