Perhaps derived from shi (“to tear, slash, scratch”). Also compare seicha, soicha.
siicha
- (transitive) to rip, tear, break
- Cáceres, Natalia (2011) “siicha”, in Grammaire Fonctionnelle-Typologique du Ye’kwana[1], Lyon
- Hall, Katherine (2007) “-išiča-dɨ”, in Mary Ritchie Key & Bernard Comrie, editors, The Intercontinental Dictionary Series[2], Leipzig: Max Planck Institute for Evolutionary Anthropology, published 2021