peripeteia (n.) Look up peripeteia at Dictionary.com
also peripetia, 1590s, from Greek peripeteia "a turn right about; a sudden change" (of fortune, in a tragedy), from peri "around" (see peri-) + stem of piptein "to fall," from PIE *pi-pt-, reduplicated form of root *pet- "to rush; to fly" (see petition (n.)).