Definitions
verb
start or re-start vigorously
“The Secretary of State intends to jumpstart the Middle East Peace Process”
verb
start (a car engine whose battery is dead) by connecting it to another car's battery
noun
starting an automobile engine that has a weak battery by means of jumper cables to another car
“my battery was dead so I had to get a jumpstart from my neighbor”
Look “jumpstart” up elsewhere
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