to pluck and clean feathers or the like (see Molina and Karttunen)
IPAspelling:
momotsɑlwiɑː
Alonso de Molina:
momotzalhuia. nitetla. (pret. onitetlamomotzalhui) rozar, o repelar pluma, o cosa semejante. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 059r. col. 1. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
MOMOTZALHUIĀ vl to pluck, clean feathers or something of the sort / rozar o repelar pluma o cosa semejante (M), mesar a otro (C) [(1)Cf.65r, (1)Tp.206]. altern. applic. MOMOTZOĀ Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 152.