This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of sour.

n. Any sour apple.

n. Any sour apple.

n. A becoming or making sour: as, the souring of bread.

n. That which makes sour or acid; especially, vinegar.

n. The wild apple, or crab-apple; also, any sour apple.

n. Dough left in the tub after oat-cakes are baked.

n. In bleaching, the process of exposing fibers or textures to the action of dilute acid; specifically, the exposing of goods which have been treated in a solution of chlorid of lime to a dilute solution of sulphuric acid, which, by setting free the chlorin, whitens the cloth, and neutralizes the alkalis with which the cloth has been impregnated.

n. A process of dressing sealskin.

n. the process of becoming sour

"We see that here in the United States with what I call the souring of his presidency."

spoilage    spoiling   

sour   

cowering    devouring    empowering    flowering    glowering    powering    scouring    showering    towering