knock-knee /ˈnɑkˈni, ˌni/
  皮膝,內八腳,X 腳
  knock-knee /ˈnɑkˈnɪ, ˌnɪ/ 名詞
  叉形膝,膝外翻
  knock-knee n. Med. A condition in which the knees are bent in so as to touch each other in walking; inknee.
  Syn: -- knock-knees, genu valgum.
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  knock-knee
       n : inward slant of the thigh [syn: genu valgum, tibia valga]