to cast a shadow on others by standing in front of them (see Molina); to obscure something (see Thouvenot, 2015, 467)
Orthographic Variants:
yeyecauilia
Alonso de Molina:
yeyecauilia. nitla. (pret. onitetlayeyecauili.) hazer sombra a otros, poniendose delante dellos. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 35r. col. 2. Thanks to Joe Campbell for providing the transcription.