elder brother or something superior, better, more (see Karttunen)
Orthographic Variants:
tiāchcāuh, tachcauh
IPAspelling:
tiɑːtʃkɑːw
Alonso de Molina:
tiachcauh. hermano mayor, y persona, ocosa auentajada, mayor y mas excelente que otras. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 112v. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
TIĀCHCĀUH elder brother or something superior, better, more / hermano mayor, y persona o cosa aventajada, mayor, y mas excelente que otras (M) Weakening of the first vowel of what was originally the prefix TĒ- leads to the form TIĀCHCĀUH with vowel length and quality change and ultimately to TĀCHCĀUH with vowel loss. TIĀCHCĀUH contrasts with TIAHCĀUH 'someone valiant,’ although they are probably cognates. See ĀCHCĀUH-TLI.
TĀCHCĀUH See TIĀCHCĀUH.
TEĀCHCĀUH See TIĀCHCĀUH. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 240.