磨 (mó) means “to rub; to grind; to polish; to sharpen; to wear down; to die out; to waste time; to pester; to insist”. It is an HSK 6 Chinese character in the HSK 3.0 vocabulary.
他花了很长时间磨这把刀。
Tā huā le hěn cháng shíjiān mó zhè bǎ dāo.
He spent a long time sharpening this knife.
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