danced step

balanced step, dancing step, dancing winder

One of a series of winders arranged so that the width of each winder tread (at the narrow end) is almost equal to the tread width in the straight portion of the adjacent stair flight.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in classic literature ?
Now bending double, now stamping furiously upon the ground, now leaping into the air, he danced step by step in the narrowing circle that would presently bring him within spear reach of the intended feast.