unfermented or partly fermented grape juice.
wine in which increased fermentation has taken place because of the addition of stum.
verb (used with object), stummed, stumming.
to increase the fermentation of (wine) by adding stum.

1650–60; < Dutch stom dumb, dull; compare French vin muet, German stummer Wein, in the same sense Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stum (stʌm)
1.  a less common word for must
2.  partly fermented wine added to fermented wine as a preservative
vb , stums, stumming, stummed
3.  to preserve (wine) by adding stum
[C17: from Dutch stom dumb; related to German stumm]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Unless he stum- bled on a competent housemaid, nothing ever got done.
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