something (such as a knife) that has been nicked or dulled (see Molina)
IPAspelling:
tehtekwinɑːwki
Alonso de Molina:
tetecuinauhqui. cosa mellada. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 106v. col. 2. Thanks to Joe Campbell for providing the transcription.