black iron en · NOUN
Etymology
From the typical paint color and material traditionally used for free weights (cast iron with black paint).
Meanings
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(qualifier:gym jargon, uncountable) Free weights as opposed to exercise machines.
The problem we had was not the concept or the product, but what to do with the space. To put a beauty salon alongside a black iron gym was ludicrous.
2017, Ken Heathcote, We're Going To Live Forever: The Secrets To Eternal Youth, page 44:There^([sic]) always lifting big, black iron and such, grunting, screaming out shit and slamming down the barbells […]
2021, Jane Brooke, Vegas Savages: