1. Drive as fast as you can; push the accelerator down. We're going to be late—pedal to the medal!

2. Do something with maximum speed or effort. Pedal to the metal, boys—we need to get these packages shipped by the end of the day.

1. To press down the accelerator (of an automobile) as far as possible; to accelerate to or travel at the maximum speed. It would normally take us three days driving to New York from Colorado, but with my brother putting the pedal to the metal, we made it in two. We're going to be late—put the pedal to the medal!

2. By extension, to do something with maximum speed or effort. Put the pedal to the metal, boys—we need to get these packages shipped by the end of the day.