to shelter, or cover something from the wind (see Molina)
Orthographic Variants:
ecatzaqua
Alonso de Molina:
ecatzaqua. n. (pret. onecatzacu.) abrigar, o guardar algo del viento. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 28r. col. 1. Thanks to Joe Campbell for providing the transcription.