having a jaw of or like iron: an iron-jawed press; an iron-jawed fighter.
fiercely determined: an iron-jawed will.

Origin of iron-jawed

First recorded in 1880–85 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for iron-jawed

Historical Examples of iron-jawed

  • "Muddy gasoline," nodded Millbank tersely—an iron-jawed, over-groomed man of forty, with a florid face shaved blue.

    The Fighting Chance

    Robert W. Chambers

  • Big Medicine was transformed into a cold-eyed, iron-jawed fighting machine.

    Flying U Ranch

    B. M. Bower

  • An iron-jawed fellow he is, with every muscle in his well-knit body to match.

    A Tramp's Wallet

    William Duthie