sour mash

Noun sour mash has 2 senses

• sour mash(n = noun.substance) - a mash with optimum acidity for yeast fermentation; a mixture of old and new mash; used in distilling some whiskeys;
is a kind of mash

• sour mash(n = noun.food) sour mash whiskey - any whiskey distilled from sour mash;
is a kind of whiskey, whisky