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English definition of “runaway”

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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 from the Cambridge Business English Dictionary © Cambridge University Press)
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