run away

verb3

1. •
   To flee by running.

   • The crowd had to run away from the burning structure with only the clothes on their backs.
2. •
   To leave home, or other place of residence, usually unannounced, or to make good on a threat, with such action usually performed by a child or juvenile.

   • My parents want me to take a bath every day? Fine, I'm running away.
3. •
   To become a runaway. (of a device or vehicle)

   • The train's brakes failed and it ran away.
   • An autotrim failure can cause stabiliser trim to rapidly run away in the nose-up or nose-down direction.