noun
a person who has run away
adjective
having run away or escaped
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The police were called to search for a runaway teenager who had been missing for two days.
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I heard there was a runaway dog in the neighborhood, have you seen it?
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My little brother is a total runaway, always causing trouble and never listening to anyone.
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The idea of starting a new business was like a runaway train, gaining momentum and speed with each passing day.