As a Noun: 1. The pedal on which you press with your foot in order to make a vehicle go faster. English = accelerator. 2. Driving with one's foot on the accelerator; driving at high speed. English = speeding. 3. In mathematics and physics, the rate at which the speed of an object is increasing. English = acceleration. As a Verb or Adjective: 1. To press on the accelerator in order to make a vehicle go faster. English = accelerate. Idiomatic English = put one's foot down. 2. To drive with one's foot on the accelerator; to drive at high speed. English = speed. 3. Of a moving object, to increase in speed. English = accelerate.