to carry something heavy under one's arm
ciyacauia. nitla. (pret. onitlaciyacaui.) sobarcar algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 22r. col. 2. Thanks to Joe Campbell for providing the transcription.