One of the mysteries of the English language finally explained.
1with object To sleep beyond (a specified time, etc.). Also occasionally refl.: to oversleep. Now rare.
2with object To sleep (a period of time, etc.) out or to an end; to overcome through sleep; to sleep (something) off.
3with object To sleep longer than.
Mid 16th century; earliest use found in John Bale (1495–1563), bishop of Ossory, evangelical polemicist, and historian. From out- + sleep.
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