Definitions 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:   a candidate with no chance of winning but who may draw enough votes to prevent one of the leading candidates from winning
• noun:   someone who pampers or spoils by excessive indulgence
• noun:   someone who takes spoils or plunder (as in war)