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Meaning of iron man

i'ron man'

Pronunciation: [key]
  1. a person, as a worker or athlete, of great physical endurance who can be depended upon to perform a given task or job tirelessly.
  2. a machine that performs a job formerly done by hand; robot.
  3. a dollar bill or a silver dollar.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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