Definition
To begin a new activity or job with immediate energy and effectiveness.
雷厉风行
The new manager hit the ground running, leading the team ahead of schedule immediately upon starting.
新经理一上任就立即带领团队超前进度。
After months of preparation, the new product hit the ground running upon its release and became very popular.
经过数月的准备，新产品一推出就大受欢迎。
She is very good at adapting to new environments; she hits the ground running every time she changes jobs.
她非常擅长适应新环境；每次换工作都能立即上手。