catqui.

Headword: 
catqui.
Principal English Translation: 

to be, as in to be in a place (like estar, in Spanish)

IPAspelling: 
kɑtki
Lockhart’s Nahuatl as Written: 

catqui. archaic present sing. of cah. seen most often in set phrase iz catqui, here is.
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), 213.

Attestations from sources in English: 

catqui (irregular verb) = from ca, to be (in a place)
Daniel Garrison Brinton, Ancient Nahuatl Poetry: Containing the Nahuatl Text of XXVII Ancient Mexican Poems (1887), 151.