to open a mound in order to let the irrigation water into the field; to flood a field with irrigation water (see Molina and Rémi Siméon)
IPAspelling:
ɑːtɬɑːʃiliɑ
Alonso de Molina:
atlaxilia. nitla. (pret. onitlaatlaxili.) abrir la era para regarla. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 8v.
col. 1. Thanks to Joe Campbell for providing the transcription.