桩
zhuāng · HSK 7
stump
🪵 木 (wood) + 庄 (zhuāng sound) = a wooden stake; as a measure word it counts matters, like 一桩事
桩 — wood radical 木 + 庄 (zhuāng, phonetic)
桩 is a semantic-phonetic compound: 木 'wood/tree' gives the meaning, while 庄 supplies the sound zhuāng. It originally referred to a wooden stake or post driven into the ground, and by extension came to mean a pile, stump, or—as a measure word—a 'matter' or 'item' of business.