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leaven

verb [T]
 
 
/ˈlev.ən/

Definition

to add a substance to bread or another food made with flour to make it get bigger when it is cookedPreparing foodPreparing food using heat formal to make something less boring: Even a speech on a serious subject should be leavened with a little humour.Making things betterBecoming better
(Definition of leaven verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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