An attachment called a spoiler which is usually located below the front bumper . Its design shape and placement helps to reduce the flow of air under the vehicle. It may help to increase the flow of air to the radiator and engine compartment, affect Aerodynamic drag , or affect positive and negative lift.
AIR DAM
Meaning of AIR DAM in English
English dictionary of automotive terms. Английский словарь автомобильных терминов. 2012