Morgoth's Foot...

Hello, everybody. My friend has just recently read the Silmarillion for the first time, and we were discussing it not too long ago. As we were, he brought an interesting point to mind. When Fingolfin and Morgoth duel, The Silmarillion says the Fingolfin hews Morgoth's foot. Now, does that mean that it was cut, or cut all the way off? There has probably been a topic about this, but if there is, I can't find it. Any of your input would be helpful. Thank you.