To lift weights (to improve one's body shape or increase one's muscle mass). My brother-in-law is obsessed with pumping iron and getting huge biceps.I'm going to gym after work to pump some iron.
Lift weights, as in She's started pumping iron three times a week. This idiom was born with the late-20th-century stress on physical fitness. [Second half of 1900s]
(informal) do exercises in which you lift heavy weights in order to strengthen your muscles: I should take more exercise, but I’m not interested in pumping iron at the local gym three evenings a week.
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