nī^grĕo — Lewis & Short
nī^grĕo, ēre, v. n.1. niger,
I to be black (ante-class.): solis occasu nigret, Pac. ap. Non. 144, 11 (Trag. Rel. v. 88 Rib.):
nimbis nigret, opp. splendet,Att. ib. 13 (Trag. Rel. v. 260 Rib.).