plainclothesman

or plain·clothes man

[ pleyn-klohz-muhn, -man, -klohthz- ]
/ ˈpleɪnˈkloʊz mən, -ˌmæn, -ˈkloʊðz- /

noun, plural plain·clothes·men [pleyn-klohz-muhn, -men, -klohthz-]. /ˈpleɪnˈkloʊz mən, -ˌmɛn, -ˈkloʊðz-/.

a police officer, especially a detective, who wears ordinary civilian clothes while on duty.

Origin of plainclothesman

First recorded in 1925–30; plain clothes + man
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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