to get rid of the wheat (clear out the land), or the like; or, to replenish the land (see Molina)
IPAspelling:
iːʃteːmiːtiɑ
Alonso de Molina:
ixtemitia. nitla. (pret. onitlaixtemiti.) arrasar trigo, o cosa semejante. o henchir hoyos de tierra. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 47v. col. 1. Thanks to Joe Campbell for providing the transcription.