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n. or jack rabbit
Any of several large, long-eared, long-legged hares of the genus Lepus.
intr.v. jack·rab·bit·ed, jack·rab·bit·ing, jack·rab·bits
To move or begin to move rapidly or suddenly: "A rear tire blew out and the car jackrabbited out of control" (Sonny Kleinfield).
Moving or beginning to move in a sudden, rapid manner: won the race with a jackrabbit start.
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.
(Animals) any of various W North American hares, such as Lepus townsendi (white-tailed jack rabbit), having long hind legs and large ears
[C19: shortened from jackass-rabbit, referring to its long ears]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
any of various large hares of W North America, having long hind legs and long ears.
1. resembling a jack rabbit, as in suddenness or rapidity of movement.v.i.
2. to go or start forward with a rapid, sudden movement.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.