sour-mash

sour mash

noun
a blended grain mash used in the distilling of some whiskeys, consisting of new mash and a portion of mash from a preceding run and yielding a high rate of lactic acid.

Origin:
1880–85, Americanism

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World English Dictionary
sour mash
 
n
1.  a grain mash for use in distilling certain whiskeys, consisting of a mixture of new and old mash
2.  any whiskey distilled from such a mash

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