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English definition of “ferment”


verb [I or T]     /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.Physical and chemical processes fermentation     /ˌfɜː.menˈteɪ.ʃən/ US  /ˌfɝː-/ noun [U] Physical and chemical processes
(Definition of ferment verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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