A step that is wrong, a false step.On a high ledge, a misstep could be fatal.
Grey Riders|8While chasing the rabbit this slope had appeared interminable to him; now, ... burdened as he was, he did not think of length or height or toil. He remembered only to avoid a misstep and to keep his direction.
(figurative) An error or mistake.His comment was a misstep that could cost him.