Definition of: stum

(stum) noun
1. Unfermented or partly fermented grape juice.
2. Wine revived, as by adding must, to produce increased fermentation; must.
—v.t. stummed, stum·ming
1. To stop fermentation in by some admixture.
2. To revive (wine), as by adding must, so as to increase fermentation. [<Du. stom must, lit., silent]