buâ-ba̍k磨墨

to grind ink

to grind ink; to grind an inkstick on an inkstone

English Wiktionary, “磨墨” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%A3%A8%E5%A2%A8 · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)