Definition of "plain-clothes" [plain-clothes]

• Alternative spelling of plain clothes. (adjective)

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• "A plain-clothes police officer (P) sees a man he believes to be the same man (D) he saw rob a bank earlier."
• "They are turned away by plain-clothes police, often violently."
• "Just this month came the news of activist Haleh Sahabi, who died of a heart attack after being beaten by plain-clothes security forces."