pay.

Headword: 
pay.
Principal English Translation: 

to drink a purgative or a syrup (see Molina)

Alonso de Molina: 

pay. ni. (pret. onipaic.) tomar o beuer purga, o xaraue.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 79r. col. 1. Thanks to Joe Campbell for providing the transcription.