Translation guide
The English word 'leaven' can refer to a substance that causes dough to rise (like yeast or baking powder), or metaphorically to something that transforms or lightens a situation. This guide covers both the literal baking sense and the figurative use.
To refer to yeast, baking powder, or other leavening agents used in baking.
The most common word for yeast, especially baker's yeast. Often used in recipes and everyday conversation.
To describe a person, quality, or influence that makes a situation less heavy or more lively.
Literally 'something that softens the atmosphere.' A natural way to express the figurative sense of leaven as a positive, lightening influence.
彼女のユーモアはいつも場の雰囲気を和らげる。
Her humor always leavens the atmosphere.
The English figurative use of 'leaven' is not directly expressed with a single Japanese noun. Using イースト or 酵母 metaphorically would sound strange. Instead, describe the effect or use a verb phrase.
彼女の存在が職場を明るくした。
Her presence leavened the workplace.
パンを作るにはイーストが必要です。
You need yeast to make bread.
A more scientific or formal term for yeast. Can refer to yeast in general, including wild yeasts.
天然酵母でパンを焼く。
Bake bread with natural yeast.
Baking powder, a chemical leavening agent. Used for cakes, cookies, and quick breads.
このケーキにはベーキングパウダーが入っています。
This cake contains baking powder.
A general term for leavening agent, including yeast, baking powder, and baking soda. Used in technical or ingredient list contexts.
膨張剤として重曹を使う。
Use baking soda as a leavening agent.
Means 'something that has a good influence.' Can be used when leaven refers to a positive moral or social influence.
彼の誠実さがチームに良い影響を与えた。
His integrity leavened the team.
Instead of a noun, Japanese often uses a verb phrase to express the action of leavening. For example, 和らげる (soften) or 軽くする (lighten).
彼の冗談が重い空気を和らげた。
His joke leavened the heavy mood.