[f. SOUR v.] That becomes or makes sour.
1710. M. Henry, Christianity No Sect, Wks. 1857, II. 445/1. The leaven of the Pharisees which is both souring and swelling.
1859. Dickens, T. Two Cities, II. xv. A sour wine, or a souring, for its influence on the mood of those who drank it was to make them gloomy.
1883. Grant White, Washington Adams, 33. Pleasing and picturesque, and yet souring and doughing.
