WordReference Random House Unabridged Dictionary of American English © 2026
plain•clothes•man
(plān′klōz′mən, -man′, -klōᵺz′-),USA pronunciation n., pl. -men
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(-mən, -men′).USA pronunciation
- a police officer, esp. a detective, who wears ordinary civilian clothes while on duty.
- plain clothes + man1 1925–30