to get warm gradually, to warm oneself bit by bit (see Molina)
IPAspelling:
totoːniʃtiw
Alonso de Molina:
totonixtiuh. ni. (pret. onitotonixtia.) yrse callentando poco a poco. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 150v. col. 2. Thanks to Joe Campbell for providing the transcription.