Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.


This is, of course, a day-and-night or light-and-darkness myth.

After one day-and-night cycle, they found that it was uninhabitable.

After a hard fortnight of day-and-night work he was ordered a few days off, and sulkily resigned himself to inaction.

The night was cold and wet, and thus terminated the fourth day-and-night's difficulties, trials, and dangers!

At the end of three days of self-starving and of day-and-night work, he had collected ninety-four cents.

It was another case of day-and-night work to put the mechanism into condition for production.

It's a day-and-night rush job to get her in commission, and you'll be paid time and a half while she's repairing.

The day-and-night fear of detection in which Dave had lived for all these weeks had wrecked his self-control at last.


Old English niht (West Saxon neaht, Anglian næht, neht) "night, darkness;" the vowel indicating that the modern word derives from oblique cases (genitive nihte, dative niht), from Proto-Germanic *nakht- (cf. Old Saxon and Old High German naht, Old Frisian and Dutch nacht, German Nacht, Old Norse natt, Gothic nahts).

The Germanic words are from PIE *nekwt- "night" (cf. Greek nuks "a night," Latin nox, Old Irish nochd, Sanskrit naktam "at night," Lithuanian naktis "night," Old Church Slavonic nosti, Russian noch', Welsh henoid "tonight"), according to Watkins, probably from a verbal root *neg- "to be dark, be night." For spelling with -gh- see fight.

Cf. German Weihnachten "Christmas." In early times, the day was held to begin at sunset, so Old English monanniht "Monday night" was the night before Monday, or what we would call Sunday night.

To work nights preserves the Old English genitive of time. Night shift is attested from 1710 in the sense of "garment worn by a woman at night" (see shift (n.1)); meaning "gang of workers employed after dark" is from 1839. Night soil "excrement" (1770) is so called because it was removed (from cesspools, etc.) after dark. Night train attested from 1838. Night life "habitual nocturnal carousing" attested from 1852.


Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.