ferment

A process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol.

A state of agitation or turbulent change or development.

“the political ferment produced new leadership”

A substance capable of bringing about fermentation.

Cause to undergo fermentation.

“We ferment the grapes for a very long time to achieve high alcohol content”

Go sour or spoil.

Be in an agitated or excited state.

“The Middle East is fermenting”

“Her mind ferments”

Work up into agitation or excitement.

“This religion is fermenting Africa”