Principal English Translation: 

on end, upright; or, on foot (see Molina)

Alonso de Molina: 

iyaquic. de punta. s. cayo.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 36v. col. 2. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

telpochiiaqui = a leading youth (drawing from telpoch, youth, and yacatl, nose?)
Florentine Codex, Book 8, 21st chapter.

See also: