verb (used without object), overslept, oversleeping.
to sleep beyond the proper or intended time of waking: He overslept and missed his train.
verb (used with object), overslept, oversleeping.
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!

1350–1400; Middle English; see over-, sleep

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World English Dictionary
oversleep (ˌəʊvəˈsliːp)
vb , -sleeps, -sleeping, -slept
(intr) to sleep beyond the intended time for getting up

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Don't oversleep or avoid the outdoors because it's cold outside.
Fer fear they would oversleep themselves, they sat up all night.
Go to bed as soon as you start feeling tired, and don't oversleep.
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