knock-kneed
  (a.)內彎足的,八字腳的,
  knock-kneed /-ˈnɪd/ 形容詞
  knock-kneed a. Having the legs bent inward so that the knees touch in walking. [Written also knack-kneed.]
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  knock-kneed
       adj : having the knees abnormally close together and the ankles
             wide apart