noun
bow legs; bow-leggedness
Refers to a condition where the legs curve outward at the knees, resembling the letter O. Often contrasted with X脚 (knock knees).
See also: X脚
彼はO脚を矯正するためにインソールを使っている。
He uses insoles to correct his bow legs.
O脚は見た目だけでなく、膝の痛みの原因にもなる。
Bow legs not only affect appearance but can also cause knee pain.