Start with the animal: a female fox at the edge of a field, quick, sharp-faced, watchful, hard to corner. Every other use of the word is that animal pointed at a woman, and each use takes a different part of her. Point at the bite and you get the insult. Point at the sleek look and you get the informal compliment-that-is-not-quite-one. The animal itself is neutral; the moment the word moves to a person, it carries a judgement.
From the word’s history
An alteration of earlier fixen, from Middle English fixen or fixene and Old English fyxen, a female fox. The v at the start comes from southern dialect forms of Middle English, where f was voiced.
它由更早的 fixen 變來，可以往上追到中古英文 fixen／fixene 和古英文 fyxen，意思就是母狐狸。開頭的 v 來自中古英文南部方言，那裡習慣把 f 讀成有聲的 v。
Wiktionary entry for vixen, supplied in this packet (kaikki extract, source_ref kaikki:3f6f69a190036ae4:397526561:47774).
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