verb (used without object), overslept, oversleeping.
beyond the proper or intended time of waking: He overslept and missed his train.
verb (used with object), overslept, oversleeping.
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: 1350–1400; Middle English;