钢筋铁骨 gāngjīntiěgǔ hard as nails Origin Definitions Defs Strokes Stroke Words Sentences Sents 钢筋 鋼筋 gāngjīn rebar steel reinforcing bar used to strengthen concrete; also called 钢条 gāngtiáo or 钢骨 gānggǔ铁骨 鐵骨 tiěgǔ firm character Metaphor for a person with strong, unyielding will or character; upright and firm.