Is this an idiom? Because I don't think it's physically possible to break your palm.
It's not an idiom. I'm not an expert, but I'm pretty sure it is possible to break one of the bones of the palm.
Yes there are. They are called Metacarpals. And yes, they certainly can be broken.
Synp, let's end this discussion. It's not going anywhere. You are using a different definition of palm than I am.
No, Telstar2 is right. The palm of your hand is the inner surface of the hand, just as the back of your hand is the outer surface of the hand. You don't break either of them. You break your hand or you brake a specific bone.
Adam, the bone is in the hand. The palm is just the surface. You only use the word palm to describe things that are outside the hand. Specifically if something is in the palm of your hand you are holding it -- It's not a bone.
LOL! That's not true at all. I broke one metacarpal when I was 10...a bone inside the palm. If you press on your palm, you can feel the bones in there. Just look at a skeleton. If you didn't have any bones in your palm, what would the bones of your fingers be attached to? ;-)