to improve or clear up (speaking of the weather) (see Molina)
Orthographic Variants:
yetlaqualcanti
Alonso de Molina:
yetlaqualcanti (pret. yeotlaqualcantic.) abonar, o aclarar el tiempo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 36r. col. 1. Thanks to Joe Campbell for providing the transcription.