to become hardened or obstinate, or to make someone else that way (see Molina)
Orthographic Variants:
yollotlaquaua, yollotlaquahua
Alonso de Molina:
yollotlaquaua. nite. (pret. oniteyollotlaquauh.) endurecer a otro.
yollotlaquaua. ni. (pret. oniyollotlaquauac.) endurecerse desta manera. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 40v. col. 2. Thanks to Joe Campbell for providing the transcription.