[jak-rab-it] /ˈdʒækˌræb ɪt/

resembling a , as in suddenness or rapidity of movement:
The car made a jackrabbit start when the traffic light turned green.
verb (used without object)
to go or start forward with a rapid, sudden movement.

1863, American English, shortening of jackass-rabbit (1851), so called for its long ears. Proverbial for bursts of speed (up to 45 mph).


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