to write a letter (see Molina); or, to paint or write something on paper
IPAspelling:
ɑːmɑtɬɑhkwiloɑ
Alonso de Molina:
amatlacuiloa. n. (pret. onamatlacuilo.) escreuir carta. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 4v. col. 1. Thanks to Joe Campbell for providing the transcription.