want: [12] Etymologically, to want something is to ‘lack’ it (a sense still intact in the noun want); ‘wishing to have’ is a secondary extension of this. The word was borrowed from Old Norse vanta ‘be lacking’. This in turn was descended from a prehistoric Germanic *wanatōn, which was formed from the base *wan- ‘lacking’ (source also of English wane). => wane[want etymology, want origin, 英语词源]