iron man

noun

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. Slang. a dollar bill or a silver dollar.

iron man

noun

1. an event at a surf carnival in which contestants compete at swimming, surfing, running, etc
2. a competitor at such an event

Word History and Origins

Origin of iron man¹

First recorded in 1610–20