the world > animals > mammals > group Ungulata (hoofed) > family Equidae (general equines) > habits and actions of horse > [noun] > leap > buck > horse given to
buck-jumper1848
bucker1884
sunfisher1903
1848 H. W. HaygarthRecoll. Bush Life Austral. vii. 78 An expert ‘buck-jumper’ usually begins when his rider is in some degree off his guard.
1882 Detroit Free Press 2 Dec. 1/6 That pony is a mustang and buck-jumper.