1. s.o.’s shadow. 2. a part of the spirit that leaves the body when one is frightened. 3. a domesticated animal that prospers under the care of its owner. 4. person or animal that gets along well with s.o.
Eloise Quiñones Keber, "An Introduction to the Images, Artists, and Physical Features of the Primeros Memoriales," in Fray Bernardino de Sahagún, Primeros Memoriales, ed. Thelma D. Sullivan, et al. (Norman: University of Oklahoma Press, 1997), 19.