Gas pedal.
Meaning: This means the pedal used to control the acceleration of a vehicle. It's like saying, The pedal that you press with your foot to make the car go faster.
Choice of Words: Gas is a noun that refers to a fuel used to power a vehicle. Pedal is a noun that refers to a lever that is pressed with the foot to control a machine. Together, "Gas pedal" refers to the pedal used to control the acceleration of a vehicle.
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Related Expressions