DCHP-1 Online
buck-jumper 
n. at stampedes, rodeos, etc., a horse specially given to bucking and, for this reason, used as a mount in bronco-riding competitions.
See also: bucking horse
- 1900 The art of breeding and the advantages of breeding something better than the "ten-dollar buck-jumper" are too often disregarded.
- 1942 Now Scottie Fraser has a good buck-jumper, and . . . I induced him to say I might ride it.
- 1900 The art of breeding and the advantages of breeding something better than the "ten-dollar buck-jumper" are too often disregarded.