n. & v.
--n. unfermented grape-juice; must.
--v.tr. (stummed, stumming)
1. prevent from fermenting, or secure (wine) against further fermentation in a cask, by the use of sulphur etc.
2 renew the fermentation of (wine) by adding stum.
Etymology: Du. stommen (v.), stom (n.) f. stom (adj.) dumb