peripeteia/ˌpɛrɪpɪˈtʌɪə,ˌpɛrɪpɪˈtiːə/nounFORMALnoun: peripeteia; plural noun: peripeteias
- a sudden reversal of fortune or change in circumstances, especially in reference to fictional narrative.”the peripeteias of the drama”
Origin

late 16th century: from Greek peripeteia ‘sudden change’, from peri- ‘around’ + the stem of piptein ‘to fall’.