Definition of step:
to move the foot in walking; to advance or recede by raising and moving one of the feet to another resting place, or by moving both feet in succession; to walk; to go on foot; esp., to walk a little distance; as, to step to one of the neighbors
"home the swain retreats, His flock before him stepping to the fold. - Thomson?
an advance or movement made from one foot to the other; a pace; a rest, or one of a set of rests, for the foot in ascending or descending, as a stair, or a rung
of a ladder
"the breadth of every single step or stair should be never less than one foot. - Sir H. Wotton