\Stum\, n. [D. stom must, new wort, properly, dumb; cf. F.
vin muet stum. Cf. {Stammer}, {Stoom}.]
1. Unfermented grape juice or wine, often used to raise
   fermentation in dead or vapid wines; must.
         Let our wines, without mixture of stum, be all fine.
                                               --B. Jonson.
         And with thy stum ferment their fainting cause.
                                               --Dryden.
2. Wine revived by new fermentation, reulting from the
   admixture of must. --Hudibras.

\Stum\, v. t. [imp. & p. p. {Stummed}; p. pr. & vb. n.
{Stumming}.]
To renew, as wine, by mixing must with it and raising a new
fermentation.
      We stum our wines to renew their spirits. --Floyer.