A window regulator is a device that helps control the movement of a car's window. It is usually a mechanical system that allows you to raise or lower the window with ease. Full definition
I have had my car in this dealership several times for a bad window regulator in the drivers door and they still can't fix the problem. (dealerrater.com)
I bring it back 3 months later for the next oil change and to have the rear window regulator fixed. (dealerrater.com)
Last but not least, this model is known for having very faulty window regulators. (autolist.com)