sentences:  It derives from the Old Norse "greip" ('hand [with spread thumbs], handle').In "Skáldskaparmál" (The Language of Poetry), Thor meets Gjálp as he is trying to wade across the Vimur River; she is causing the river to swell with what appears to be her urine or menstrual fluids as she is standing "astride the river".Thor eventually reaches Geirrödargardar, the abode of the giant Geirröðr.