[ oh-ver-sleep ]
/ ˌoʊ vərˈslip /

verb (used without object), o·ver·slept, o·ver·sleep·ing.

to sleep beyond the proper or intended time of waking: He overslept and missed his train.

verb (used with object), o·ver·slept, o·ver·sleep·ing.

to sleep beyond (a certain hour): She had overslept her usual time of arising.
to let (oneself) sleep past the hour of arising: Of all mornings to oversleep myself!

Origin of oversleep

Middle English word dating back to 1350–1400; see origin at over-, sleep
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for oversleep

British Dictionary definitions for oversleep

/ (ˌəʊvəˈsliːp) /

verb -sleeps, -sleeping or -slept

(intr) to sleep beyond the intended time for getting up
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012