for a pustule or boil to throb (see Karttunen)
CUITLACHAPĀN(I) for a pustule or boil to throb / punza, palpita (grano, etc) (T) [(1)Tp.122]. See CUITL(A)-TL, CHAPĀN(I). Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 72.