What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
1Chiefly with the, this, etc. Earth as opposed to heaven or the heavens; the earthly world.
2With the. The mythical abode of the dead, imagined as being under the earth, the underworld; specifically the place of the damned, hell.
Late Middle English; earliest use found in John Trevisa (c1342–?1402), translator. From lower + world.