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.
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.
(Horse Training, Riding & Manège) Austral an untamed horse
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014