The phrase "works fingers bone" is an idiom that means to work very hard. The spelling is quite straightforward: "works" as /wɜrks/, "fingers" as /ˈfɪŋɡərz/, and "bone" as /boʊn/. The origin of this phrase is unclear, but it is believed to have originated in the 16th century. It is commonly used in the English language to describe someone who puts in a lot of effort and dedication into their work.