to pound, crush, beat, dent, damage; or, to break something with a stone (see Molina)
Alonso de Molina:
tepatlachoa. nitla. (pret. onitlatepatlacho.) machucar o quebrantar algo con piedra. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 102v. col. 1. Thanks to Joe Campbell for providing the transcription.