But the long run, the excitement, and his weakened nerves caused the fatal misstep.

Well, that was a fatal misstep on his part.

I knew him in his better days, before a fatal misstep felled him to the ground.

This was a fatal misstep, for the chief ran the poor fellow through with his spear.

Her one fatal misstep had shattered that dream.

Napoleon after his downfall himself admitted that his passage of the Pyrenees was the fatal misstep in his career.

But it was still hidden, and in seeking it there was danger of some fatal misstep in the treacherous snow.