I. ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun
Etymology: jack (I) (jackass) + rabbit; from its long ears
: any of several large hares (genus Lepus ) of western No. America having very long ears and long hind legs and living in open country sometimes in such large numbers as to do much injury to forage and crops
II. intransitive verb
( -ed/-ing/-s )
: to make a sudden lurch or jump or a fast start
a car jackrabbiting down the street — Paul Jones