/ Dictionary / Index P plainclothesman: Meaning and Definition of Find definitions for: plain•clothes•man Pronunciation: (plān'klōz'mun, -man", -klōz'-), [key] — pl. -men a police officer, esp. a detective, who wears ordinary civilian clothes while on duty. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plainclothesman (Thesaurus) plain clothes plain dealing Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language