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Noun: stum  stúm
  1. Unfermented grape juice or wine, often used to raise fermentation in dead or vapid wines; must
  2. Wine revived by new fermentation, resulting from the admixture of must
Verb: stum (stummed,stumming)  stúm
  1. To renew, as wine, by mixing must with it and raising a new fermentation

Derived forms: stums, stumming, stummed