If a person is knock-kneed, their knees lean in towards each other, so the knees sit closer than the ankles. When they stand with their feet a little apart, the knees may almost touch — the old picture is that the knees knock together.

If a person is knock-kneed如果一個人是X型腿， their knees他的膝蓋 lean in towards each other會往彼此靠攏， so the knees sit closer than the ankles使得膝蓋比腳踝還靠近。 When they stand with their feet a little apart當他們雙腳微微張開站著時， the knees膝蓋 may almost touch可能幾乎會碰在一起 — the old picture is that the knees knock together舊時的說法就是膝蓋會「knock（互撞）」在一起。

The opposite shape is bow-legged, where the knees stay wide and the legs look like a bow.

The opposite shape相反的形狀 is bow-legged是O型腿， where the knees stay wide膝蓋會分得很開 and the legs look like a bow腿看起來像一把弓。

Quite a few children look a bit knock-kneed and then grow straighter; in adults it can just be the way their body is built.

Quite a few children不少小孩 look a bit knock-kneed看起來有點X型腿 and then grow straighter後來會長得比較直； in adults在成人身上 it can just be the way their body is built這可能只是天生的體型。

It is a body-shape word, a little old-fashioned and blunt, not a kind nickname. Doctors have a more technical name for the same shape, but ordinary English still says knock-kneed.

It is這是 a body-shape word一個形容體型的詞， a little old-fashioned and blunt有點老派又直白， not a kind nickname不是個和善的暱稱。 Doctors醫生 have a more technical name有個比較專業的說法 for the same shape指同一種體型， but ordinary English不過一般英文 still says knock-kneed還是說knock-kneed。