buckjumping

buck·jump

 (bŭk′jŭmp′)
intr.v. buck·jumped, buck·jump·ing, buck·jumps
1. To buck, as a horse or mule does.
2. To move in sudden jerks; lurch.

buck′jump·er n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

buckjumping

(ˈbʌkˌdʒʌmpɪŋ)
n
(Horse Training, Riding & Manège) Austral a competitive event for buckjumpers in a rodeo
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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I won medals at buckjumping in Australia, and I held more than several swimming records from the quarter of a mile up.
After they married, they moved to a house at Neutral Bay with a backyard large enough to hold their new horse, my father having sold Rocky Ned and his other buckjumping horses and bought a sensible Clydesdale, Dobbin.