mid-14c., from Old French levain "leaven, sourdough" (12c.), from Latin levamen "alleviation, mitigation," but used in Vulgar Latin in its literal sense of "a means of lifting, something that raises," from levare "to raise" (see lever). Figurative use from late 14c.
leaven (v.)
c. 1400, from leaven (n.). Related: Leavened; leavening.
例文
1. A few jokes add leaven to a boring speech.
いくつかのジョークは、味気ないスピーチに活気を添えることができます。
2.He found congenial officers who knew how to leaven war 's rigours with riotous enjoyment.
お祭り騒ぎで戦争を薄めるという過酷な志を知った将校を見つけた。
3.The leaven of reform was working.
改革の影響力が働いている。
4.You are the leaven which binds together the entire fabric of our national system of defence.
あなたたちは我が国の国防システム全体を構成する最も重要な要素です。dd> スピーチセクションから
5.These men have been the leaven in the lump of the race.