Stum

• POS: Noun, Verb (usu participle)

CIDE DICTIONARY

Stum, n. [D. stom must, new wort, properly, dumb; cf. F. vin muet stum. Cf. Stammer, Stoom.].

•  Unfermented grape juice or wine, often used to raise fermentation in dead or vapid wines; must.  [1913 Webster]

  "Let our wines, without mixture of stum, be all fine."  [1913 Webster]

  "And with thy stum ferment their fainting cause."  [1913 Webster]
•  Wine revived by new fermentation, reulting from the admixture of must.  Hudibras.  [1913 Webster]

Stum, v. t. 

 To renew, as wine, by mixing must with it and raising a new fermentation.  [1913 Webster]
"We stum our wines to renew their spirits."  [1913 Webster]

OXFORD DICTIONARY

Stum, 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