oversour

English

Etymology

From Middle English oversour, equivalent to over- +‎ sour.

Adjective

oversour (comparative more oversour, superlative most oversour)

1. Overly or excessively sour; too sour.
   • 1903, Monthly Bulletin, volumes 3-4, page 24:

     Let milk become oversour and observe odors of decomposition.

Verb

oversour (third-person singular simple present oversours, present participle oversouring, simple past and past participle oversoured)

1. (intransitive) To become too sour.
   • 1914, John Michels, Creamery Butter-making, page 85:

     On warm days the milk might oversour, while on cooler days it would be found comparatively sweet unless a good deal of attention was given to keeping the temperature where it would sour in the proper length of time.