tlacahua -yollo.

Headword: 
tlacahua -yollo.
Principal English Translation: 

for someone to grant or concede something, to be generous; often said in a spirit of giving thanks, could be translated as "thanks"
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), 235.

Lockhart’s Nahuatl as Written: 

The verb is cāhua, Class 2; since this is a set phrase, the preterit can take the archaic form ōtlacāuhqui with the obsolete preterit suffix. 235

themes: 
Behavior, Personality