1. A pedal that controls the throttle valve; SYN. accelerator pedal, gas pedal, gas, throttle, gun.
2. A valve that regulates the supply of fuel to the engine; SYN. throttle, throttle valve.
3. Increases the kinetic energy of charged particles; SYN. particle accelerator, atom smasher.

A pedal that controls the throttle valve

ETYM Dim. of throat. Related to Throat.
The throttle valve on an engine, used to control the speed by regulating the amount of fuel injected into the system.