Ran into this:
He came to a desk. On it lay a metal paper knife with an ornate handle. Would it be sharp enough? He reached for it and knocked over a small brass jar. Stamps spilled out of it and it fell to the Boor with a clatter. "Hey," Mrs. Barrows yelled from the kitchen, "are you tearing up the pea patch?" Mr. Martin gave a strange laugh. Picking up the knife, he tried its point against his left wrist. It was blunt. It wouldn't do. Source
It is obvious the man has knocked over the jar so made it fall off the desk, the stamps spilled out and the contact between the metal jar and the floor made a clatter, noise. However, What does it fell to the Boor with a clatter mean exactly? I checked the meaning of Boor but apparently here it has another sense other than the normal ones. Is it an idiom or something?