souring
加酸
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.
They keep out melancholy from the virtuous, and hinder the hatred of vice from souring into severity. --Addison.
◄ ►
Sour·ing n. Bot. Any sour apple.
◄ ►
souring
n : the process of becoming sour