[count] 1 : a person or thing that spoils something: such as a : a political candidate who cannot win but who prevents another candidate from winning by taking away votes
b chiefly US : a person or team that surprisingly defeats a competitor that is expected to win
▪ They played (the role of) the spoiler and ruined our chance to play in the finals.
c : information about the things that happen in a movie, book, etc., that spoils the surprise or suspense for someone who has not seen it or read it yet
▪ The review contains a few spoilers, so don't read it if you haven't seen the movie. 2 a : a long narrow part on the back of an automobile that prevents it from lifting off the road at high speeds
b : a part of an airplane's wing that may be raised to control the amount of lift produced by the wing