revving

v.发动机旋转；加快速度

n.发动机的旋转

Don't rev the engine so hard. 别让发动机转得太快。

If you rev up your engine too fast,you may damage it. 如果你使发动转速太快，就会把它弄坏的。

The engine was doing a steady 4000 revs (per minute). 引擎达到（每分钟）4000转的恒定转速。