Meaning : Starting an automobile engine that has a weak battery by means of jumper cables to another car.
Example :
My battery was dead so I had to get a jumpstart from my neighbor.
Synonyms : jump-start
Meaning : Start (a car engine whose battery is dead) by connecting it to another car's battery.
Synonyms : jump, jump-start
Meaning : Start or re-start vigorously.
Example :
The Secretary of State intends to jumpstart the Middle East Peace Process.
Synonyms : jump-start