From Longman Dictionary of Contemporary Englishgas pedalˈgas ˌpedal noun [countable] American EnglishTTC the thing that you press with your foot to make a car go faster SYN accelerator
Examples from the Corpus
gas pedal• Pressing the gas pedal to the floor, he swung the car out and began to overtake.• His foot eased to the gas pedal, then froze. 