runaway [ˈrʌnəˌweɪ]

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¹ runaway noun

• someone (such as a child) who leaves home without permission : someone who runs away from home

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² runaway adjective

• —used to describe a person who has left home without permission or who has escaped from some place
• operating, running, increasing, etc., in a fast and dangerous way that cannot be controlled
• extremely successful