to stand by one's word, to follow through on a promise
Orthographic Variants:
zannempanca quitoa, çan nempanca quitoa
Alonso de Molina:
zannempanca quitoa. cumplir de palabra. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 14v. col. 1. Thanks to Joe Campbell for providing the transcription.