peripeteia

/pษ›ษนษชpษชหˆtaษชษ™/
noun
  1. 1

    A sudden reversal of fortune as a plot point in Classical tragedy.

  2. 2

    (by extension) Any sudden change in circumstances; a crisis.

  3. 3

    A turning point in psychosocial development.

Source: https://en.wiktionary.org/wiki/peripeteia