the movement of a bat, racket, or the like, toward the back of a player in preparation for the forward movement with which the ball is struck.
Origin of backswing
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for backswing
Historical Examples of backswing
On the backswing, it thwacked resoundingly against the thug's ribcage.Nor Iron Bars a Cage....
Gordon Randall Garrett