to go along growing (speaking of the body) (see Molina)
Alonso de Molina:
ninantiuh. (pret. oninantia.) yr creciendo enel cuerpo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 72r. col. 1. Thanks to Joe Campbell for providing the transcription.