jumpstart(n = noun.act)jump-start - 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"
To start (the engine of a motor vehicle) using a temporary connection to supply electrical power from another vehicle or another source of current; -- an emergency procedure used when a vehicle's own battery has insufficient power to start the vehicle normally.
To provide a speedy start to (an activity) using the assistance of some external impetus; to re-energize (an activity proceeding sluggishly); -- accomplished by application of a stimulus not normally used in the activity. [PJC]