To jump-start a vehicle which has a flat battery means to make the engine start by getting power from the battery of another vehicle, using special cables called jump leads.
To jump-start a system or process that has stopped working or progressing means to do something that will make it start working quickly or effectively.
例句
The EU is trying to jump start the peace process.欧盟正试图推动和平进程。
英英词典释义
Verb
1. start a car engine whose battery by connecting it to another car's battery
2. start or re-start vigorously;
"The Secretary of State intends to jumpstart the Middle East Peace Process"