Principal English Translation:
came to do (purposive action, a motion toward; past tense of quiuh, quihui)
Lockhart’s Nahuatl as Written:
present/past of the purposive motion form -quīuh/-co for motion in toward the point of reference. pl. -coh. James Lockhart, Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 215.
Attestations from sources in English:
ōmotlālīco = he came to sit down
Michel Launey, An Introduction to Classical Nahuatl, translated and adapted by Christopher MacKay (Cambridge: Cambridge University Press, 2011), 227.
But it is not always purposive. It can be that the action didn't have a definite conclusion. Whereas, -to definitely did conclude. (central Mexico, sixteenth century)
Personal communication, James Lockhart, in sessions analyzing Huehuetlatolli.
necico = appeared (and in this construction, the -co literally means "came to," putting the neci, to appear, in the past tense)
tlacatico = was born (literally, came to be born, came to be a person)
Rebecca Horn's notes from Nahuatl classes with James Lockhart at UCLA. Card file in the possession of Stephanie Wood.