to tell the future by looking in water (see Molina, with the example given in the first person singular)
Alonso de Molina:
atl nicmana. (pret. atl onicman.) agorear en agua. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 8v. col. 2. Thanks to Joe Campbell for providing the transcription.