run away
US /rʌn əˈweɪ/
UK /rʌn əˈweɪ/

1.
2.
descontrolarse, desbocarse
to lose control and become wild or unmanageable
:
•
The horse ran away with its rider.
El caballo se desbocó con su jinete.
•
The costs of the project started to run away.
Los costos del proyecto comenzaron a descontrolarse.