It means nothing it just means that your knees are tired or are aching!
Of course. You can feel weakness in any body part. When you get excited or anxious, you often feel wobbly, especially in your legs and knees, as if they are about to collapse.
No. Actually, the elephant is the only animal with four knees.
legs'
Horses do not have knees in the same sense that humans do. They have front legs with knees that are equivalent to our wrists, and hind legs with hocks, which are the equivalent to our ankles. Instead of bending their legs at the "knee," horses extend their legs or "lock" them in place.
They have 2 knees, each with one patella. So they have 2 patellas, not four. These are located on their hind legs. Their front legs have elbows, not knees.
Yes, cats have knees. They have knees in their hind legs, but they are not as prominent as human knees because of their anatomy and the way their leg bones are structured.
It's not an idiom - it's a description of what happens when you get nervous and excited. Your legs feel wobbly and you might even fall over because your knees get weak and collapse underneath you.
They're not really called knees, but yes, they are on the front legs, they bend like our knees, and the back legs bend like our elbows. :) hope i helped
African American's knees are black to match the skin on their thighs and lower legs much like the knees of European American's, having white knees that also match the skin of their legs.
Because your legs will hurt and you'll feel tired
Penguins appear to have very short legs and no knees because only the lower leg is externally visible. Their knees and upper legs are feather covered.