one who detains another person (see Molina); possibly also one who checks for broken or dislocated bones (see "tezalo" in Molina)
Alonso de Molina:
tezaloani. detenedor de alguno. &c. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 91v. col. 2. Thanks to Joe Campbell for providing the transcription.