Sway - A movement away from the target by the golfer's body on the backswing that moves enough weight toward their back foot, that they could hold the top of their backswing position.
If you are stripe'n it or not Good clubhead awareness and application makes up for a lot of stuff people might point out as a problem.
I prefer more of a "quiet rotation" and my old mentor George Knudson professed the head had nothing to do with the golf swing and shouldn't be a focal point.