chipini. (pret. ochipin.) gotear, o caer gota. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 21r. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
CHIPĪN(I) to drip / gotear o caer gota (M) T has a variant TLACHIPĪN(I) with the same gloss. M has a corresponding transitive verb chipinia ‘to scatter something in droplets.’ Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 53.