to be sick due to a side ache or an aching of the ribs
Orthographic Variants:
yomotlanquauhtic
Alonso de Molina:
yomotlanquauhtic. enfermo de dolor de costado. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 41v. col. 1. Thanks to Joe Campbell for providing the transcription.