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flat sour

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noun

fermentation occurring in canned foods after sealing.

canned food so fermented.

Origin of flat sour

First recorded in 1925–30

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for flat sour

Historical Examples of flat sour

This "flat-sour" is not harmful and must not be confused with "botulinus," which is harmful.
Every Step in Canning
Grace Viall Gray
However, the taste and odor are so disagreeable you will have no desire to eat "flat-sour" canned goods.
Every Step in Canning
Grace Viall Gray
Flat-sour often causes annoyance to beginners in canning some vegetables, such as corn, peas, beans and asparagus.
Every Step in Canning
Grace Viall Gray