ferment
— Verb
– English
~ work up into agitation or excitement; "This religion is fermenting Africa"
ferment
— Verb
– English
~ cause to undergo fermentation; "We ferment the grapes for a very long time to achieve high alcohol content"; "The vintner worked the wine in big oak vats"
ferment
— Verb
– English
~ go sour or spoil; "The milk has soured"; "The wine worked"; "The cream has turned--we have to throw it out"