to remove a scab or crust from someone else (see Molina)
Alonso de Molina:
chipelhuia. nitetla. (pret. onitetlachipelhui.) descostrar algo a otro. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 21r. col. 2. Thanks to Joe Campbell for providing the transcription.