to push someone under the water (see Molina, who provides the example in the first person singular, present tense)
Alonso de Molina:
atlan nitecalaquia. (pret. atlan onitecalaqui.) çabullir a otro enel agua. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 8r. col. 2. Thanks to Joe Campbell for providing the transcription.