if you rev an engine, or if it revs, you press the accelerator with your foot when the vehicle is not moving in order to make the engine operate faster加快(发动机)转速
Armstrong revved the engine and drove off. 阿姆斯特朗加大油门后驾车飞驰而去。
➡ see also revolutionADJECTIVE | REV + NOUN | PHRASESADJECTIVE➤high, low (both especially BrE) 高轉速;低轉速◇The engine is almost silent at low revs.發動機在低轉速時幾乎沒有聲音。➤engine發動機的轉速REV + NOUN➤counter (BrE) 轉速表PHRASES➤revs a minute, revs per minute每分鐘轉速