To throttle someone means to kill or injure them by squeezing their throat or tightening something around it and preventing them from breathing.

If you say that something or someone is throttling a process, institution, or group, you mean that they are restricting it severely or destroying it.

The throttle of a motor vehicle or aircraft is the device, lever, or pedal that controls the quantity of fuel entering the engine and is used to control the vehicle's speed.

Throttle is the power that is obtained by using a throttle.

If you say that something is done at full throttle, you mean that it is done with great speed and enthusiasm.