something that makes an illness worse or makes it spread (see Molina)
Orthographic Variants:
tecocoliz tlapiuilli
Alonso de Molina:
tecocoliz tlapiuilli. cosa que acrecienta la enfermedad. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 93r. col. 1. Thanks to Joe Campbell for providing the transcription.