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

  • 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
  • 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
  • This "flat-sour" is not harmful and must not be confused with "botulinus," which is harmful.

    Every Step in Canning|Grace Viall Gray