to end up dark-green-black; or discolored (see Molina)
Orthographic Variants:
xuxuuia, xoxouia, xoxohuia
Alonso de Molina:
xuxuuia. ni. pararse verdinegro, o descolorido. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 162r. col. 2. Thanks to Joe Campbell for providing the transcription.