[f. BUCK sb.1 + JUMP.] A leap like that of a buck. esp. A jump from the ground made by an untamed or vicious horse, with the feet drawn together and the back arched, to unseat the rider. (Of American or Australian origin.) Hence Buck-jump v. = BUCK v.3; also Buck-jumper, Buck-jumping vbl. sb.
1844. Sydney Morn. Her., 24 Sept., 4/5. The deceased struck the horse with his heels to spur it on, and he attributed the mare’s buck-jumping to this circumstance.
1878. H. Smart, Play or Pay, i. (ed. 3), 18. Harlequin [a horse] … indulged in a couple of buck jumps.
1882. Detroit Free Press, 29 Oct., 9/4. That pony is a mustang and buck-jumper.
1885. Parsons Sun, 5 Feb., 2/6. The majority of the horses there [in Australia] are vicious and given to the trick of buck-jumping.
