to begin (the motor of an auto) simply by using a booster cable attached to the battery pack of some other automobile or by engaging the drive train while the automobile is rolling downhill or being pressed.
Informal To start or reinvigorate (an activity, system, or process): "struggled to jump-start his once front-running . . . presidential campaign” ( Susan Feeney).
to start out an automobile by passing an electric existing from a charged battery pack towards discharged battery associated with the car being begun, by means of a booster cable connecting both battery packs.
To reactivate or rejuvenate.
begin (a motor vehicle engine whose electric battery is dead) by connecting it to another automobile's battery pack