become black, grow dark
Latin word, found 10 times in the texts on Socratos.
Vergil, Aeneid 4.454: horrendum dictu, latices nigrescere sacros,
Ovid, Fasti 5.323: in spe vitis erat; caelum nigrescit ab Austris,
Martial, Epigrammata 8.77.5: Candida nigrescant vetulo crystalla Falerno
All forms of nigresco