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In [vehicles]: A device attatched to a car- usually at the rear, that changes the [aerodynamic] shape of a vehicle, reduces drag- which does not add downforce- and acts as a rear diffuser, [eliminating a] vacuum effect at the rear end of the car and improving gas milage. Often mistaken for a wing or airfoil, which does the opposite by creating drag. Before you hit that down button, google wing vs. spoiler.
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