rev
noun [ C usually plural ] informal uk/rev/ us/rev/
（发动机的）一转
a revolution (= one complete turn of a part in an engine)
Keep the revs up (= the engine parts turning quickly) or the engine will stall. 保持发动机高速运转，不然车就会熄火。
a rev counter 转数计数器
Compare: rpm
rev
verb [ I or T ] uk/rev/ us/rev/ -vv-
（使）快速运转
to increase the operating speed of an engine while the vehicle is not moving, usually to warm it to the correct temperature
The noise of the car engine revving up woke the whole neighbourhood. 汽车发动机高速转动的声音把整个社区的人都吵醒了。
Phrasal verb
rev up (someone/something) （使）活跃起来;（使）积极起来
to become more active, or to make someone or something become more active
The hotel is revving up for the busy summer season. 正值忙碌的夏季，这家饭店的节奏也变快了。
drugs which rev up your nervous system 刺激神经系统的药物