Definitions

from The American HeritageĀ® 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 controlā€ ( 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

Etymologies

jack(ass) (from its long ears) + rabbit.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Blend of jackass and rabbit (Wiktionary)

Examples

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