寝かせる

ねかせる · nekaseru · JLPT N1 · verb-ichidan

to ferment

🛏️ 寝る (sleep) + causative -かせる: make sleep, so put to bed or lay down

Same root as 寝る, to sleep. Dough or wine left to rest is 'put to sleep' while it matures, which is why 寝かせる also means to ferment.

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