HSK 7-9
磨
mó动
to rub; to grind; to polish; to sharpen
师傅正在磨那把旧菜刀。
Shīfu zhèngzài mó nà bǎ jiù càidāo.
The craftsman is sharpening that old kitchen knife.
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Appears across levels (7-9) in the HSK 3.0 word list.