the GNU version of the Collaborative International Dictionary of English
n. Bad small beer.
n. Any bad spirituous liquor, especially when adulterated so as to be very deleterious.
The Century Dictionary and Cyclopedia
n. Bad or adulterated liquor, injurious to the stomach and bowels; in the United States, specifically, whisky adulterated with deleterious substances to cheapen it while increasing its apparent strength.
Injurious and corrosive: said of bad liquor.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. any alcoholic beverage of inferior quality
Word Usage
"That doesn’t even do it well, because I’ve had some very good plonk, and rotgut is never good."