Throttle
Part of speech: verb
Definition: To cut back on the speed of an engine, a person or organization. To strangle or choke someone.
Part of speech: noun
Definition: 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. The lever or pedal that controls this valve.
Restrain
Part of speech: verb
Definition: To control or keep in check.To deprive of liberty.To restrict or limit.
Example sentence: Playing a bad guy is always a freeing experience, because you don't have the same envelope of restrictions as you have playing a good guy. Good guys restrain themselves; they kind of have their moral fiber cut out for them in varying degrees.