fermenting (Noun) — A process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol.
fermenting (Verb) — Go sour or spoil. ex. "The milk has fermented"
fermenting (Verb) — Cause to undergo fermentation. ex. "We ferment the grapes for a very long time to achieve high alcohol content"
fermenting (Verb) — Be in an agitated or excited state. ex. "The Middle East is fermenting" ex. "Her mind ferments"
fermenting (Verb) — Work up into agitation or excitement. ex. "Islam is fermenting Africa"