to verify something fully or examine a matter (see Molina), literally to get at its roots or source?
Orthographic Variants:
inelhuayocan naci
Alonso de Molina:
inelhuayocan naci (pret. inelhuayocan onacic.) verificar enteramente, o examinar el negocio. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 38v. col. 2. Thanks to Joe Campbell for providing the transcription.