Oxford Dictionary English plain clothes nounnoun BrE BrE//ˌpleɪn ˈkləʊðz// ; NAmE NAmE//ˌpleɪn ˈkloʊðz// ; BrE BrE//ˌpleɪn ˈkləʊz// ; NAmE NAmE//ˌpleɪn ˈkloʊz// [plural] The police Add to my wordlistjump to other resultsordinary clothes, not uniform, when worn by police officers on duty officers in plain clothes See related entries: The police Wordfinderpolicearrest, charge, cordon, detain, detective, interrogate, plain clothes, police, raid, undercoverSee plain clothes in the Oxford Advanced American DictionaryCheck pronunciation: plain clothes oxfordlearnersdictionaries.com