to brush off or shake out someone's clothing for them (see Molina and related terms)
Alonso de Molina:
tlatzetzelhuia. nite. sacudir ropa o otra cosa, de alguno. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 142v. col. 2. Thanks to Joe Campbell for providing the transcription.