打磨
dǎ mó · HSK 7
polish
💎✨ dǎ mó = strike + grind — hit something then smooth it out
打 means to hit or strike, 磨 means to grind or rub. Together they describe the process of polishing: you strike away the rough parts, then grind until smooth. Think of a craftsman working a gemstone down to a shine.
打 — hand radical 扌 + nail 丁
打 combines the hand radical 扌 (action with the hand) with 丁 (originally a nail), suggesting striking or hitting with the hand. 丁 also serves as a phonetic hint in older readings. The meaning broadened from 'to strike' to a general verb for many hand-based actions, like 打电话 'make a phone call'.
磨 — stone 石 + hemp 麻 (phonetic)
A semantic-phonetic compound: 石 'stone' gives the meaning (grinding involves stones), while 麻 'hemp' supplies the sound. Originally referred to a millstone or the act of grinding grain, later extending to 'rub, polish, wear down' and figuratively 'to torment' or 'waste time'.