From Longman Dictionary of Contemporary Englishjump-startˌjump-ˈstart verb [transitive] 1 TTC (also jump American English) to start a car whose battery has lost power by connecting it to the battery of another car2 HELPto help a process or activity to start or become more successful Congress hopes the tax cut will jump-start the economy. —jump start noun [countable]→ See Verb table