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cast-iron

adjective
🔊/ˌkɑːst ˈaɪən/
🔊/ˌkæst ˈaɪərn/
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  1. made of cast iron铸铁制的
    • a cast-iron bridge铸铁桥
  2. (British English) very strong or certain; that cannot be broken or fail有力的；确实的；坚定不移的
    • a cast-iron guarantee/promise永不反悔的保证；铁誓
    • a cast-iron excuse/alibi有说服力的辩解；不在犯罪现场的确凿证据
    compare ironcladTopics Successc2, Doubt, guessing and certaintyc2