American Dictionary

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Definition cast-iron in American English

cast-iron adjective

adjective
1

made of cast iron

Synonyms and related words
2

very definite, and certain to be effective

Example

She claims to have a cast-iron alibi.

Example

cast-iron safety procedures

Synonyms and related words
3

very strong, or able to deal with difficult conditions

Example

a cast-iron stomach

Example

cast-iron nerves

Synonyms and related words
Definition cast-iron in American English