flat sour
- fermentation occurring in canned foods after sealing.
- canned food so fermented.
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Origin of flat sour
First recorded in 1925–30
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for flat sour
Historical Examples
This "flat-sour" is not harmful and must not be confused with "botulinus," which is harmful.
Every Step in CanningGrace Viall Gray
However, the taste and odor are so disagreeable you will have no desire to eat "flat-sour" canned goods.
Every Step in CanningGrace Viall Gray
Flat-sour often causes annoyance to beginners in canning some vegetables, such as corn, peas, beans and asparagus.
Every Step in CanningGrace Viall Gray