Speakeasy

wiktionary

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speak +‎  easy

etymonline

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speakeasy (n.)

"unlicensed saloon," 1889 (in the New York "Voice"), from verbal phrase, from speak (v.) + easy (adv.); so called from the practice of speaking quietly about such a place in public, or when inside it, so as not to alert the police and neighbors. The word gained wide currency in U.S. during Prohibition (1920-1932). In early 19c. Irish and British dialect, a speak softly shop meant "smuggler's den."