JACKRABBIT Meaning of JACKRABBIT in English jack ‧ rab ‧ bit /ˈdʒækˌræbət, ˈdʒækˌræbɪt/ BrE AmE noun [countable] a large North American ↑ hare (=animal like a large rabbit) with very long ears Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012