What is the meaning of throttle?

noun

• A valve that regulates the supply of fuel to the engine.
  • synonyms: accelerator, throttle valve
• A pedal that controls the throttle valve.
  • usage: "he stepped on the gas"
  • synonyms: accelerator, accelerator pedal, gas pedal, gas, gun

verb

• Place limits on (extent or access. )
  • usage: "restrict the use of this parking lot"; "limit the time you can spend with your friends"
  • synonyms: restrict, restrain, trammel, limit, bound, confine
• Kill by squeezing the throat of so as to cut off the air.
  • usage: "he tried to strangle his opponent"; "A man in Boston has been strangling several dozen prostitutes"
  • synonyms: strangle, strangulate
• Reduce the air supply.
  • usage: "choke a carburetor"
  • synonyms: choke