swipple

noun

1. The part of a flail that is free to swing, and which strikes the grain in threshing.

   “The flail has now become such a rare agricultural implement that it is well to bear in mind that its two main parts were the handstaff and swipple.”

   “As showing the local influence of the tool, one may refer to the custom in Yorkshire by which a girl, on being proposed to, took a piece of straw and broke it into two lengths (long and short), typifying the handstaff and swipple of the flail. If she gave the former to her lover, she accepted him: but if she tendered the shorter piece, "she gave him 't swipple end," or rejected him.”

   “Traditional flails had a handle (haft), usually about 40 inches long, and a swipple (also called a swingle), about 24 inches long. The two pieces were hinged together with leather or eel skin.”