throttle

Short definition from Wiktionary

Noun

1. 1
   A valve that regulates the supply of fuel-air mixture to an internal combustion engine and thus controls its speed; a similar valve that controls the air supply to an engine.
2. 2
   The lever or pedal that controls this valve.
3. 3
   The windpipe or trachea.

Verb

1. 1
   To control or adjust the speed of (an engine).
2. 2
   To cut back on the speed of (an engine, person, organization, network connection, etc.).
3. 3
   To strangle or choke someone.
4. 4
   To have the throat obstructed so as to be in danger of suffocation; to choke; to suffocate.
5. 5
   To breathe hard, as when nearly suffocated.
6. 6
   To utter with breaks and interruption, in the manner of a person half suffocated.