Wikipedia
Ball change
Ball change is a dance move that consists of two steps: a partial weight transfer on the ball of a foot (placed e.g., behind), followed by a step on the other foot. This action has a syncopated feeling and counted &1, or &2, or a1, or a2, etc., i.e., the "ball" step splits off the end of the previous beat.
Usage examples of "ball change".
Step shuffle ball change, stepshuffle ball change, step brush hop, step brush hop.