noun
knock-kneed; pigeon-toed
Describes a leg condition where the knees are close together and the feet are apart (knock-kneed), or where the toes point inward (pigeon-toed). Often used in medical or descriptive contexts.
彼はうちわにで、歩き方が少し不自然だ。
He is knock-kneed, and his way of walking is a little awkward.
うちわにの人は、足の内側に体重がかかりやすい。
People who are pigeon-toed tend to put weight on the inner side of their feet.
Means bow-legged, the opposite condition where the knees are apart and the feet are together.
The kanji 内 (inside) and 鰐 (crocodile) are used as ateji for their sounds, not their meanings. The word itself is of uncertain origin, but it may be related to the shape of the legs resembling a crocodile's stance, or it may simply be a phonetic rendering.