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English definition of “runaway”

runaway

adjective [not gradable]  /ˈrʌn·əˌweɪ/ us  

runaway adjective [not gradable] (not controlled)

being or seeming to be out of control, or happening suddenly and strongly: runaway health-care costs From the moment he launched the Boy Scout movement in 1908, it was a runaway success.

runaway

noun [C]  /ˈrʌn·əˌweɪ/ us  

runaway noun [C] (person)

a young person who has left home without permission
(Definition of runaway from the Cambridge Academic Content Dictionary © Cambridge University Press)
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