Definition of "Spoiler" :

noun: a hinged airfoil on the upper surface of an aircraft wing that is raised to reduce lift and increase drag

noun: an airfoil mounted on the rear of a car to reduce lift at high speeds

noun: someone who pampers or spoils by excessive indulgence

noun: someone who takes spoils or plunder (as in war)

noun: a candidate with no chance of winning but who may draw enough votes to prevent one of the leading candidates from winning