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English definition of “run in/through sb's head/mind”

run in/through sb's head/mind

If something is running in/through your head/mind, you cannot stop thinking about it or singing it silently: I've had that tune running in my head all day.Continually thinking about
(Definition of run in/through sb's head/mind from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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