磨杵成针 Traditional 磨杵成針 mó chǔ chéng zhēn 🔊 to grind an iron bar down to a fine… + Keep this word Meanings mó chǔ chéng zhēn 磨杵成針 to grind an iron bar down to a fine needle (idiom); fig. to persevere in a difficult taskto study diligently Its characters 磨móto rubHSK 7–9杵chǔpestle成chéngto succeedHSK 6针zhēnneedleHSK 6