cast-iron

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cast-iron

Describes something that is reliable and unlikely to change. This term is always used before a noun. You can trust me, OK? I only make cast-iron promises.

cast-iron

BRITISH or

cast iron

mainly AMERICAN
A cast-iron guarantee, piece of evidence, etc. is absolutely certain and can definitely be believed. They are demanding cast-iron guarantees of a fair hearing. Even if one could visualize her as a murderer, she has a cast-iron alibi. They will punish you for being late, unless you've a cast-iron excuse.