Put the pedal to the metal
Definition 1 of 2
Pro Tip 1/3Informal Usage
The phrase is casual and best used in informal conversations or storytelling. 
Hearing police sirens, Jake put the pedal to the metal.
Pro Tip 2/3Figurative Speech
It's a metaphor, meaning it should not be taken literally. It's just expressing urgency or speed. 
In the final race, he really put the pedal to the metal.
Pro Tip 3/3Action Intensity
It emphasizes the intensity of the action, suggesting maximum effort is being applied. 
The getaway car put the pedal to the metal.