: The activity of weightlifting, especially for the purposes of bodybuilding.(noun)
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Use "pumping iron" in a sentence
"The tattoos of the fighting rooster and coiled-up cobra on his forearms were bulging like he’d been pumping iron all night long, getting ready to pound Stani if he ever saw him again."
"During the campaign, she had been photographed pumping iron for a cover story in George magazineBushs Kissinger: She Can Kick Your Butt Too."