nightening

Verb

nighten (third-person singular simple present nightens, present participle nightening, simple past and past participle nightened)

1. (intransitive) To become night or grow dark, as night.
   • The flame of these smudge pots was just the type which presented itself in my vision, fluttering like a flag and giving off enough dark smoke to nighten the wooden sculpture above and around the flame.1996, Frederick Kiesler, Siegfried Gohr, Gunda Luyken, Frederick J. Kiesler: selected writings, page 60