The pivoted or swinging bar to which the traces, or tugs, of a harness are fastened, and by which a carriage, a plow, or other implement or vehicle, is drawn; a whiffletree; a swingletree; a singletree. See Singletree.

Bar on a plough where the traces are fixed.

a crossbar that is attached to the traces of a draft horse and to the vehicle or implement that the horse is pulling

The cornel tree.