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English word sous vide comes from French sous (Below, under (slang) money.), French vide
sous (French)
Below, under (slang) money.
vide (French)
(empty) space. Emptiness. Gap. Vacuum, void Blank (page, tape). Empty. Vacant; unfurnished (apartment).
sous vide (English)
(usually, used attributively) Any method of cooking and packaging food in a vacuum.