What metaphors are used in Elder Edda by Anonymous?

The figure of speech called a "kenning" is a kind of condensed metaphorical expression. It most often contains a real, or implied, comparison, or else defines a concept with reference to something else. Thus, a ship (which may be thought of as galloping over the waves) is called a "sailsteed"; a warrior, a "helm-tree" because, helm-clad, he stands proudly erect like a tree, braving the "shower-of-arrows" (as the battle is designated for obvious reasons).