ferment - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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ferment

verb [I or T] uk   /fəˈment/  us   /fɚ-/
If food or drink ferments or if you ferment it, the sugar in it changes into alcohol because of a chemical process: You make wine by leaving grape juice to ferment until all the sugar has turned to alcohol.
fermentation
noun [U] uk   /ˌfɜː.menˈteɪ.ʃən/  us   /ˌfɝː-/

ferment

noun [U] uk   /ˈfɜː.ment/  us   /ˈfɝː-/ literary
a state of confusion, change, and lack of order or fighting: The resignation of the president has left the country in ferment.
(Definition of ferment from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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