duàn
to forge
to discipline; wrought
The metal radical grounds the meaning: forging is literally the craft of shaping metal under repeated blows. 段 contributes the sound duàn and carries no further semantic weight here.
锻造
duàn zào
to forge (metal)
锻炼
duàn liàn
to toughen
锻铁
duàn tiě
wrought iron
体育锻炼
tǐ yù duàn liàn
physical exercise
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