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-co.

Headword: 
-co.
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 study sessions with James Lockhart in the late 1970s and early 1980s.