Search Result for "souring": 
Wordnet 3.0

NOUN (1)

1. the process of becoming sour;

The Collaborative International Dictionary of English v.0.48:

Sour \Sour\, v. i. [imp. & p. p. Soured; p. pr. & vb. n. Souring.] To become sour; to turn from sweet to sour; as, milk soon sours in hot weather; a kind temper sometimes sours in adversity. [1913 Webster] They keep out melancholy from the virtuous, and hinder the hatred of vice from souring into severity. --Addison. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Souring \Sour"ing\, n. (Bot.) Any sour apple. [1913 Webster]
WordNet (r) 3.0 (2006):

souring n 1: the process of becoming sour
Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "souring": acescence, acetification, acidification, acidulation, aggravation, amplification, annoyance, augmentation, contentiousness, deepening, deliberate aggravation, deterioration, embittering, embitterment, enhancement, enlargement, exacerbation, exasperation, fermentation, heightening, increase, intensification, irritation, magnification, provocation, sharpening, worsening