酝酿
yùn niàng · HSK 7
to mull over
🍷 酝 + 酿 both carry 酉 the wine-jar radical = to ferment, hence to let an idea brew
Literally fermenting alcohol; figuratively a crisis is brewing, or you mull and hold quiet exploratory talks before acting. Both characters share 酉, the ancient wine-vessel radical, tying the word to slow fermentation.