Webster's English Dictionary

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stum

1. stum \'st*m\ vt or stummed;  or stum.ming [D stommen, fr. stom, n.] 
   archaic  : to renew (wine) by mixing with must and reviving fermentation 
2. stum n [D stom] : unfermented or partly fermented grape juice; esp : 
   must in which  fermentation has been artificially arrested