Meanings of odd steps in English

He walks in to work every day and reportedly took the 300- odd steps in his stride.

He collapsed into it, his legs tingling like he'd run a kilometer instead of just walking twenty- odd steps.

They were odd steps, unusual steps, each level crisscrossed with black ridges that protruded above the surface, protecting the descender from the elements.

To enter, one must mount some twenty odd steps of white marble, with rails on either side of the steps made of the same material.