to cover something (such as the ground) with branches, flowers, or aromatic herbs, perhaps as part of a festival (see Molina and definitions of enramar)
Alonso de Molina:
xiuhyotia. nitla. (pret. onitlaxiuhyoti.) enramar algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 159v. col. 2. Thanks to Joe Campbell for providing the transcription.