sour
A term for a spoiled wine that’s making its turn toward vinegar. A wine with high acidity is more aptly referred to as acidic or tart than sour.
The New Wine Lovers Companion, 2nd Edition, by Ron Herbst and Sharon Tyler Herbst. Copyright © (1) 2003, 1995 by Ron Herbst and Sharon Tyler Herbst. Reprinted by arrangement with Barron's Educational Series, Inc.