Gjálp and Greip are daughters of the giant Geirröðr. They attempted to crush Thor against the ceiling rafters in their father's hall, as told in Skáldskaparmál.
Thor killed Gjálp and Greip by bracing Gríðr's staff against the rafters and pushing down, breaking their backs as they tried to lift his chair in Geirröðr's hall.
Gjálp straddled the river Vímur and swelled its waters to drown Thor as he crossed into Jötunheim, but the thunder god hurled a boulder at her and hauled himself ashore by grasping a rowan branch.
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