WordNet sense 1 (a pedal that controls the throttle valve):

accelerator, gas, gun, accelerator pedal, gas pedal

WordNet sense 2 (a valve that regulates the supply of fuel to the engine):

throttle valve

WordNet sense 3 (kill by squeezing the throat of so as to cut off the air):

strangle, strangulate

WordNet sense 4 (place limits on (extent or access)):

bound, confine, limit, restrain, restrict, trammel

WordNet sense 5 (reduce the air supply):

choke