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English definition of “runaway”

runaway

adjective [always before noun]
 
 
/ˈrʌnəˌweɪ/
a runaway success/victory/winner, etc something good that happens very quickly or easilyHigher and lower points of achievementSuccess and achievementsFailuresWays of achieving things
A runaway vehicle is moving away from somewhere without anyone controlling it: a runaway car/trainUncontrolled
(Definition of runaway adjective from the Cambridge Learners Dictionary © Cambridge University Press)
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