From Longman Dictionary of Contemporary Englishoversleepo‧ver‧sleep /ˌəʊvəˈsliːp $ ˌoʊvər-/ verb (past tense and past participle overslept /-ˈslept/) [intransitive] WAKE UP/GET UPto sleep for longer than you intended Sorry I’m late. I overslept.► see thesaurus at sleep → sleep in at sleep1→ See Verb table
Examples from the Corpus
oversleep• Sorry I'm late - I overslept.• Yet he ended his days at daily mass, even serving for the priest when the altar boy of the day overslept.• Why are you so late? Did you oversleep again?• They were afraid of oversleeping and missing the plane.• He had overslept on the day he was supposed to take the entrance exam. 