A BOTTLENECK occurs when there is some restricted element holding back the performance that could otherwise be achieved. Fluid flows much slower through the neck of the bottle than if the neck does not excess. Another word for a bottleneck is the CHOKE POINT.
Let us start with a couple of examples. In a vehicle, the traction between the tires and the road is important for optimal power delivery between the engine and the road making the car move forward. Now an example where traction would be a bottleneck if your engine were so powerful and then you go to accelerate, the wheels just spin. Now at high speeds a wing could improve traction by using airflow to force the rear of the car down towards the road. This can alleviate that bottleneck. That sounds great!
