Lit. "rain shield"?

"Note: the existence of a noun *SIS 'rain' is probably limited to this expression (i.e. it's a fossilized remnant rather than a productive noun)."  [De'vID?, personal discussion with MO at qepHom 2011]

SEE ALSO:

chal bIQ        rain(water) (n)
SIS             rain (v)

SIryoD                  body armor (old form)  (n)