he blushed "yeah it is a term for boobs" he then thought for a moment "they're...sprite, a type of mischievious fairy thatr lives in mines, they called knockers because they knock on walls, they steal food and tools and prank but they warn by knocking before a caveins, we dont know much about them but my father thinks som of them knock on the wall to cause them" he shrugged "my brothers befriended alot of them"