One of the mysteries of the English language finally explained.
Unfermented grape juice.
verbstumming, stummed, stums[with object]
1Prevent or stop the fermentation of (wine) by fumigating a cask with burning sulfur.
2Renew the fermentation of (wine) by adding stum.
Mid 17th century: from Dutch stom (noun), stommen (verb), from stom ‘dumb’.
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