Etymology
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oversleep (v.)

late 14c., "to sleep beyond the proper or desired time of waking" (intrans.), from over- + sleep (v.). Transitive sense of "to sleep beyond" is by 1520s. Related: Overslept; oversleeping. Old English had a noun oferslæp "too much sleep."

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Definitions of oversleep

oversleep (v.)
sleep longer than intended;
From wordnet.princeton.edu