WAGGLE

I. verb (~d; waggling) Etymology: frequentative of 1wag Date: 1588 intransitive verb to reel, sway, or move from side to side ; wag , transitive verb to move frequently one way and the other ; wag , waggly adjective II. noun Date: circa 1866 an instance of waggling ; a jerky motion back and forth or up and down, a preliminary swinging of a golf club head back and forth over the ball before the swing