source: Sakaki Ryoko | Wiki | Anime Amino

verb |fərˈment|

1. no object (of a substance) undergo fermentation:

発酵する

e.g. the drink had fermented, turning some of the juice into alcohol.

with object cause the fermentation of (a substance).

…を発酵させる

2. with object incite or stir up (trouble or disorder):

〈騒ぎなど〉をかき立てる, 煽る

e.g. the politicians and warlords who are fermenting this chaos.

no object (of a negative feeling or memory) fester and develop into something worse:

〈感情などが〉高ずる, 高ぶる

e.g. it had been fermenting in my subconscious for a while.

noun |ˈfərˌmənt|

1. agitation and excitement among a group of people, typically concerning major change and leading to trouble or violence:

｟かたく｠ 〖単数形で〗大騒ぎ, 興奮, 動乱

e.g. Germany at this time was in a state of religious ferment.

2. archaic a fermenting agent or enzyme.

酵素, 酵母; 発酵

fermentable |fərˈmen(t)əb(ə)l| adjective

late Middle English: from Old French ferment (noun), fermenter (verb), based on Latin fermentum ‘yeast’, from fervere ‘to boil’.