to divide something with someone, to relieve someone by taking part of the burden (see Karttunen and Molina)
IPAspelling:
ʃelwiɑː
Alonso de Molina:
xelhuia. nitetla. (pret. onitetlaxelhui.) partir con otro alguna cosa, o aliuiar quitando parte dela carga o del tributo.
xelhuia. nic. (pret. onictlaxelhui.) lo mesmo es que tlatzontlaxilia. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 158v. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
XELHUIĀ vt to divide something with someone, to relieve someone by taking part of his burden / partir con otro alguna cosa, o aliviar quitando parte de la carga o del tributo (M) applic. XELOĀ.
XILHUIĀ See XELHUIĀ. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 322.