the act of sheltering and refreshing with the shadow of something (see Molina)
Orthographic Variants:
tlaceualhuiliztli
Alonso de Molina:
tlaceualhuiliztli. el acto de guarecerse y refrigerarse ala sombra de algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 117r. col. 1. Thanks to Joe Campbell for providing the transcription.