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English definition of “runaway”

runaway

adjective [before noun] (also run-away)     /ˈrʌnəˌweɪ/
rising quickly in a way that is not under control : runaway prices / costs / inflation runaway demand / growth / spending
highly successful : a runaway bestseller/favourite/hit The reality is that a new musical needs to be a runaway hit to survive the economics of Broadway.
(Definition of runaway adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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