speakeasy

The English word “speakeasy” has 2 meanings listed here.

noun

An illegal saloon or tavern, especially one operated during the American Prohibition period in the 1920s.
In modern times, a legal bar in the style of a speakeasy, i.e. one that is hidden away and has a quiet atmosphere.

Deverbal from speak easy (= speak quietly [interj.]); for the history, see Wikipedia at speakeasy § Etymology.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.