to be in mourning, grievance for a deceased, to be covered in clothing that represents the sorrow one feels (see Molina)
Orthographic Variants:
miccaua
Alonso de Molina:
miccaua. enlutado por muerto. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 56r. col. 1. Thanks to Joe Campbell for providing the transcription.