a person or thing that spoils.
a person who robs or ravages; despoiler; plunderer.
Aeronautics. a device used to break up the airflow around an aerodynamic surface, as an aircraft wing, in order to slow the movement through the air or to decrease the lift on the surface and, as a result, provide bank or descent control.
Automotive. a similar device for changing the airflow past a moving vehicle, often having the form of a transverse fin or blade mounted at the front or rear to reduce lift and increase traction at high speeds.
Sports. a team out of final contention that defeats a potential or favored contender and thereby thwarts its chances of winning a championship.
any competitor, entrant, or candidate who has no chance of ultimate victory but does well enough to spoil the chances of another.

1525–35; spoil + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spoiler (ˈspɔɪlə)
1.  plunderer or robber
2.  a person or thing that causes spoilage or corruption
3.  Compare air brake a device fitted to an aircraft wing to increase drag and reduce lift. It is usually extended into the airflow to assist descent and banking
4.  a similar device fitted to a car
5.  sport a competitor who adopts spoiling tactics, as in boxing
6.  a magazine, newspaper, etc produced specifically to coincide with the production of a rival magazine, newspaper, etc in order to divert public interest and reduce its sales

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If you haven't seen last night's show yet, this might contain spoilers.
After all, both movements remain powerful potential spoilers.
Heading the list of potential spoilers is the rest of the world.
And the list of potential spoilers is uncomfortably similar to that of a year
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