unstable equilibrium

/AH0 N S T EY1 B AH0 L IY0 K W AH0 L IH0 B R IY0 AH0 M/
noun
  1. 1

    An equilibrium in which a small disturbance causes it to move further away from the original state

Source: https://en.wiktionary.org/wiki/unstable%20equilibrium