Principal English Translation: 

to become pointed at the tip (speaking of a canine tooth; see Sahagún)

Orthographic Variants: 
Attestations from sources in English: 

iacauitzaui = it becomes pointed at the end (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 109.