to stop doing something to do another thing, or to not care nor seek vengeance of the one who insulted me (see Molina)
Orthographic Variants:
iuh niccaua
Alonso de Molina:
iuh niccaua (pret. iuh oniccauh.) dexar de hazer vna cosa por otra, o no hazer caso ni vengarme del que me injurio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 43v. col. 1. Thanks to Joe Campbell for providing the transcription.