What is "hell-for-leather"

Usage examples of "hell-for-leather".

But always in that nightmare the Saint's fantastic optimism led him on, dancing ahead like a will-o'-the-wisp, trailing him dizzily behind into hell-for-leather audacities which Roger, in the more leisured days that followed, would remember in a cold sweat.

He hadn’t done the hell-for-leather kind of hill climbing for years, he thought, his hands like vises on the bike, getting every ounce from the gears that he could as he bent low over the machine for the run toward the knoll, then reaching up as he hit the incline, swaying his balance from side to side, his feet going out, supporting him, then pulling up, skit­tering along over the grass as he jumped the lip of concrete onto the upper-level parking lot.

He hadn't done the hell-for-leather kind of hill climbing for years, he thought, his hands like vises on the bike, getting every ounce from the gears that he could as he bent low over the machine for the run toward the knoll, then reaching up as he hit the incline, swaying his balance from side to side, his feet going out, supporting him, then pulling up, skittering along over the grass as he jumped the lip of concrete onto the upper-level parking lot.

The three Cheyenne were moving well, too-four of us going hell-for-leather, more or less in line abreast, three in paint and feathers, waving lances and guns, and one in white tie and tails, somewhat out of crease.