from The Century Dictionary and Cyclopedia
- n. Nautical, a large single block having a projection on the shell to prevent the rope that is rove through it from becoming jammed.
Sorry, no etymologies found.
As I did my big grey tom, Mister, bounded down from his place on top of one of the bookshelves, but rather than give me his usual shoulder-block of greeting, he flicked his tail disdainfully at me and ghosted out the front door.
He was able to tag Hernandez, who hit his springboard shoulder-block.