breaking point

/B R EY1 K IH0 NG P OY1 N T/
noun
  1. 1

    The point at which the increasing strain in a material causes it to break.

  2. 2

    The point at which a person or system succumbs to stresses or pressures and descends into crisis.

Source: https://en.wiktionary.org/wiki/breaking%20point