to take the lead in some matter (see Karttunen)
ACHTOPAHUIĀ vt to take the lead in some matter / guiar en alguna cosa o ser el primero en hacerla (R) [(1)Rp.48]. See ACHTOPA, -HUIĀ. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 3.