Definition of ferment verb from the Oxford Advanced Learner's Dictionary

 

ferment

 verb
verbVerb Forms present simple I / you / we / they ferment
BrE BrE//fəˈment//
 
; NAmE NAmE//fərˈment//
 
he / she / it ferments
BrE BrE//fəˈments//
 
; NAmE NAmE//fərˈments//
 
past simple fermented
BrE BrE//fəˈmentɪd//
 
; NAmE NAmE//fərˈmentɪd//
 
past participle fermented
BrE BrE//fəˈmentɪd//
 
; NAmE NAmE//fərˈmentɪd//
 
-ing form fermenting
BrE BrE//fəˈmentɪŋ//
 
; NAmE NAmE//fərˈmentɪŋ//
 
 
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BrE BrE//fəˈment//
 
; NAmE NAmE//fərˈment//
 
[intransitive, transitive] to experience a chemical change because of the action of yeast or bacteria, often changing sugar to alcohol; to make something change in this way Fruit juices ferment if they are kept for too long. (figurative) A blend of emotions fermented inside her. ferment something Red wine is fermented at a higher temperature than white.
Word Origin late Middle English: from Old French ferment (noun), fermenter (verb), based on Latin fermentum ‘yeast’, from fervere ‘to boil’.
See the Oxford Advanced American Dictionary entry: ferment

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