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1.
One who spoils; a plunderer; a pillager; a robber; a despoiler.
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2.
One who corrupts, mars, or renders useless.
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3.
A device attached to the wing of an airplane or other airfoil, which breaks the smooth flow of air during flight and decreases the lift of the airfoil; -- used to control the attitude of the airplane during banking or descent.(Aeronautics)
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4.
A device attached to a car to decrease lift and increase traction, usually shaped as a flat surface and attached above the rear of the car, and working on the same principal as the aircraft spoiler{3}.