The C. Luwian word a-ar-ši-ya-
Word a-ar-ši-ya-
IPA āršiya
Meaning to flow
See also Thracian: ars ‘to flow’
Proto-Indo-European: *au̯(e)-9, au̯ed-, au̯er- ‘to flow, to wet water’

Other words that might be of interest
ha-a-pi-in-ni ‘stream, small river’, a-la-aš-ša-am- ‘sea’, ḫa-a-pi-iš ‘river’, wa-a-ar-ša ‘water’