Fer‐ment″, v. i. 1. To undergo fermentation; to be in motion, or to be excited into sensible internal motion, as the constituent particles of an animal or vegetable fluid; to work; to effervesce.
2. To be agitated or excited by violent emotions.
But finding no redress, ferment and rage. Milton.
The intellect of the age was a fermenting intellect. De Quincey.