Hebrew

gˁš - (hitpo.) to vomit loudly (HALOT 200)

Cf. Hbr. pB. gˁš ‘to cough or sneeze’ (Jastrow 261) with a meaning shift.

PS
*gŝˁ/ˀ - to belch, retch, vomit (SED I No. 17ᵥ)