Other forms: stubs; stubbed; stubbing
The small remainder of something is a stub. If you sharpen your favorite pencil obsessively, soon you'll be left with just a stub.
Anything that's leftover or unusually short can be a stub, from the ticket stub you're handed in the theater to your dog's little stub of a tail. As a verb, stub most often means "strike painfully against something," and it's toes that you most often stub: "Put your shoes on before you run around in the yard, or you'll stub your toe again!"