noun
a sudden or unexpected reversal of circumstances or situation, especially in a literary work
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The play reached its climax with a sudden peripeteia that changed the course of the story.
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The movie had a crazy plot twist that was a total peripeteia!
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Dude, did you see that peripeteia in the show? Mind blown!
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Just when I thought everything was going smoothly, life threw a peripeteia my way.