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English definition of “leaven”

leaven

verb [T]     /ˈlev.ən/
to add a substance to bread or another food made with flour to make it get bigger when it is cooked Preparing 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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