scrap iron
 廢鐵


 Scrap n.
 1. Something scraped off; hence, a small piece; a bit; a fragment; a detached, incomplete portion.
    I have no materials -- not a scrap.   --De Quincey.
 2. Specifically, a fragment of something written or printed; a brief excerpt; an unconnected extract.
 3. pl. The crisp substance that remains after drying out animal fat; as, pork scraps.
 4. pl. Same as Scrap iron, below.
 Scrap forgings, forgings made from wrought iron scrap.
 Scrap iron. (a) Cuttings and waste pieces of wrought iron from which bar iron or forgings can be made; -- called also wrought-iron scrap. (b) Fragments of cast iron or defective castings suitable for remelting in the foundry; -- called also foundry scrap, or cast scrap.

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 scrap iron
      n : iron to be melted again and reworked