iron man
[noun]
Synonyms: dollar, bill, bone, buck, fish, frogskin, one, skin, smacker, smackeroo

[TahlilGaran] English Synonym Dictionary ▲

iron man noun phr. ['ʌɪǝn man] Pl. iron men. E17.
[from IRON noun & adjective + MAN noun.]
1. A man of iron; a brave, tough, or intransigent man; esp. a robust sportsman. E17.
b. A multi-event sporting contest demanding stamina; spec. a triathlon involving consecutively a 2.4 mile (3.9 km) swim, a 112 mile (180 km) cycle ride, and a 26.2 mile (42.2 km) run. L20.

2. A dollar; Austral. formerly also, a pound. Cf. IRON noun 11. slang (chiefly US). E20.

[TahlilGaran] English Dictionary ▲

an iron man
a man who is physically very strong and can work hard for a long time

[TahlilGaran] English Idioms Dictionary ▲