DICT.TW Dictionary Taiwan

 sou /ˈsu/
 5角銅幣

 Sou n.; pl. Sous or   An old French copper coin, equivalent in value to, and now displaced by, the five-centime piece (of a franc), which is popularly called a sou.
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 sou
      n : a former French coin of low denomination; often used of any
          small amount of money; "he hasn't a sou to his name"