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spoiler (EN)
noun

noun “spoiler”

singular spoiler, plural spoilers
  1. a piece of information that reveals important plot details or surprises, spoiling the enjoyment for someone who hasn't yet experienced it
    Don't share any spoilers; I haven't watched the final episode yet.
  2. a device on a vehicle or aircraft that reduces lift and improves stability
    The car's rear spoiler helps it stay grounded at high speeds.
  3. a person or thing that spoils or ruins something
    The sudden rain was a spoiler for our picnic plans.
  4. (US) a political candidate who cannot win but spoils another's chance of winning by taking away some votes
    The independent candidate was a spoiler.