This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any of several large, long-eared, long-legged hares of the genus Lepus.

verb-intransitive. 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.

n. any of several large North American hares of the genus Lepus

v. To make a sudden, rapid movement

v. go forward or start with a fast, sudden movement

n. large hare of western North America

"The jackrabbit was a pest, but the cottontail was worth getting."

jackrabbits   

start    jump    startle   

jackrabbit start   

nutria    barracuda    boots    Cris    dimwit    woodchuck    petunia    condor    26-06    high-gee