from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several large, long-eared, long-legged hares of the genus Lepus.
- intransitive v. To move or begin to move rapidly or suddenly: "A rear tire blew out and the car jackrabbited out of control” ( Sonny Kleinfield).
- adj. Moving or beginning to move in a sudden, rapid manner: won the race with a jackrabbit start.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. any of several large North American hares of the genus Lepus
- v. To make a sudden, rapid movement
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. go forward or start with a fast, sudden movement
- n. large hare of western North America
jack(ass) (from its long ears) + rabbit.(American Heritage® Dictionary of the English Language, Fourth Edition)
Blend of jackass and rabbit (Wiktionary)