The Oxford Etymologist waxes emotional: a few rambling remarks on fear
It is well-known that words for abstract concepts at one time designated concrete things or actions. “Love,” “hatred,” “fear,” and the rest developed from much more tangible notions. The words anger, anguish, and anxious provide convincing examples of this trend. All three are borrowings in English: the first from Scandinavian, the second from French, and the third from Latin. In Old Norse (that is, in Old Icelandic), angr and angra meant “to grieve” and “grief” respectively.