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An injurious habit of horses in which they bite at the edge of a feed trough or other object and swallow air at the same time.
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) a harmful habit of horses in which the animal leans on the manger or seizes it with the teeth and swallows a gulp of air
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014