buckjumper

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.

buckjumper

(ˈbʌkˌdʒʌmpə)
n
(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
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References in periodicals archive ?
* 'The Buckjumper' -- Ernie Pope, Roma, Queensland, 1932 (music & lyrics).
Tell any amount of crammers about buckjumpers, mountain bulls, and flyers.
The stock teams also push each other into signing up for things that only the most intense peer pressure would ever persuade anyone sane to do: riding the 'buckjumpers' or the 'bronco bulls'.