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Related to pump iron: pump some iron
To lift weights at a gym 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.
pump (some) iron
Sl. to lift weights for exercise. Andy went down to the gym to pump some iron. Mary's hobbies are pumping iron and running.
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]
If someone pumps iron, they lift heavy weights for exercise. Unlike Richard, I hadn't spent hours pumping iron and running on the treadmill.
pump ironexercise with weights. informal
pump ˈiron(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.
See pump some iron
To lift weights.