verb (used without object) 1.to
sleep beyond the proper or intended time of waking:
He overslept and missed his train.
verb (used with object) 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; Middle English; see
over-,
sleep