inacidire

Etymology
From.

Verb

 * 1)  to make acid
 * 2)  to embitter, to make (someone) harsh and resentful
 * 3)  to sour, to turn sour
 * 4)  to become sour or bitter, to become harsh and resentful
 * 1)  to become sour or bitter, to become harsh and resentful