Throttle definition

(1) A valve that regulates the supply of fuel to the engine

(2) A pedal that controls the throttle valve

"He stepped on the gas"

(3) Reduce the air supply

"Choke a carburetor"

(4) Place limits on (extent or access)

"Restrict the use of this parking lot"

"Limit the time you can spend with your friends"

(5) Kill by squeezing the throat of so as to cut off the air

"He tried to strangle his opponent"

"A man in Boston has been strangling several dozen prostitutes"