to begin to rain hard (see Karttunen)
AHHUACHTELĀHU(I) pret: -TELĀUH to begin to rain hard / empieza a llover de veras (T)[(1)Tp.107]. See AHHUACH-TLI, TELĀHU(I). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 5.