pig·skin /-ˌskɪn/
  豬皮,豬皮革,鞍
  Pig·skin n.
  1. The skin of a pig, -- used chiefly for making saddles; hence, a colloquial or slang term for a saddle.
  2. A football; -- so called because the covering is often made of pigskin. [Colloq.]
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  pigskin
       n : leather from the skin of swine