ùn-liōng醞釀

to ferment

to ferment; to brew; to mull over; to take shape and become mature; to prepare; to get ready

English Wiktionary, “醞釀” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E9%86%9E%E9%87%80 · confidence: Medium (Wiktionary, Hokkien)