1. any of several large, long-eared, long-legged hares of the genus lepus.
2. to move or begin to move rapidly or suddenly: "A rear tire blew out and the car jackrabbited out of control” ( sonny Kleinfield).
3. moving or beginning to move in a sudden, rapid manner: won the race with a jackrabbit start.

1. any of several large north american hares of the genus lepus
2. to make a sudden, rapid movement

1. go forward or start with a fast, sudden movement
2. large hare of western north america