cast-iron adjective Meaning in Cambridge Learner Dictionary
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Meaning of "cast-iron" - Learner English Dictionary

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cast-iron

adjective
 
 
/ˈkɑːstˌaɪən/
NO DOUBT [always before noun] able to be trusted completely, or impossible to doubt: I need a cast-iron guarantee that the work will be finished on time.Loyal, faithful and dependable
METAL made of cast ironMetals and metalworkingChemical elements
(Definition of cast-iron adjective from the Cambridge Learners Dictionary © Cambridge University Press)
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