rev
n. countable B2 Upper Intermediate US //ˈɹɛv// UK //ɹˈɛv// rev
n. one full turn of an engine's moving parts. You use this word when talking about how fast a car or machine is running.
n. a single complete revolution of an engine or motor. Often used in the plural to describe engine speed or power output.
The engine makes a loud noise at high revs.
You should change gears when the engine reaches a certain number of revs to avoid damage.
The driver kept the revs high while waiting for the green light, ensuring the car would accelerate instantly the moment the race began.
Usage
Commonly used in the plural form 'revs' in informal and technical contexts.