/ ˈrʌnəweɪ; NAmE / adjective , noun
■ adjective [ only before noun ]
1.
( of a person ) having left without telling anyone :
runaway children
2.
( of an animal or a vehicle ) not under the control of its owner, rider or driver :
a runaway horse / car
3.
happening very easily or quickly, and not able to be controlled :
a runaway winner / victory
the runaway success of her first play
runaway inflation
■ noun
a person who has suddenly left or escaped from sb/sth, especially a child who has left home without telling anyone :
teenage runaways living on the streets