What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
Of or belonging to the air; aerial; (hence) ethereal, spiritual, incorporeal, insubstantial.
Late Middle English; earliest use found in John Trevisa (c1342–?1402), translator. From classical Latin āerius, although most early examples of some forms could alternatively be interpreted as showing airy.