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oversleep

[oh-ver-sleep] /ˌoʊ vərˈslip/
verb (used without object), overslept, oversleeping.
1.
to sleep beyond the proper or intended time of waking:
He overslept and missed his train.
verb (used with object), overslept, oversleeping.
2.
to sleep beyond (a certain hour):
She had overslept her usual time of arising.
3.
to let (oneself) sleep past the hour of arising:
Of all mornings to oversleep myself!
Origin
1350-1400
1350-1400; Middle English; see over-, sleep
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for overslept

oversleep

/ˌəʊvəˈsliːp/
verb -sleeps, -sleeping, -slept
1.
(intransitive) 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
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Word Origin and History for overslept

oversleep

v.

late 14c., from over- + sleep (v.). Related: Overslept; oversleeping. Old English had a noun oferslæp "too much sleep."

Online Etymology Dictionary, © 2010 Douglas Harper
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14
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