cast–iron
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cast–iron
adjective
cast–iron
adjective
Learner's definition of CAST–IRON
1
:
made of cast iron
2
:
very strong or tough
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I have a cast-iron stomach. [=I can eat anything spicy, hot, etc.]
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a cast-iron will
3
British
:
not likely to fail or be broken
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You had better have a cast-iron [=(US) airtight] excuse for missing the meeting.
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a cast-iron promise
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