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Definition of cast-iron adjective from the Oxford Advanced American Dictionary

     

    cast-iron

     adjective
    adjective
     
     
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  1. 1made of cast iron a cast-iron bridge
  2. 2very strong or certain; that cannot be broken or fail a cast-iron guarantee/promise a cast-iron excuse/alibi compare ironclad
See cast-iron in the Oxford Advanced Learner's Dictionary
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