Definition of "oversleep"

oversleep

/ˈəʊvəɹˌsliːp/

verb
third-person singular simple present oversleeps, present participle oversleeping, simple past and past participle overslept
1. (intransitive) To sleep for longer than intended.
2. (reflexive, now rare) To sleep for longer than one intended.
  Quotations
  A]fter such a train of fatigue and restless nights, I had unhappily overslept myself […].
  1748, [Samuel Richardson], “Letter LXXXI”, in Clarissa. Or, The History of a Young Lady: […], volumes (please specify |volume=I to VII), London: […] S[amuel] Richardson; […]
  Theodore made awkward excuses, and attributed his delay to having overslept himself.
  1764, Horace Walpole, The Castle of Otranto, section IV
  The following morning, Toad, who had overslept himself as usual, came down to breakfast disgracefully late, [...].
  1908 October, Kenneth Grahame, The Wind in the Willows, New York, N.Y.: Charles Scribner’s Sons
3. (transitive) To sleep beyond (a given time), to sleep through (an event etc.).