[{"Bold_text": "noun", "List Items": ["a collar or enclosing band.", "the enclosing rim within which a jewel is set.", "a slotted cylindrical clamp inserted tightly into the tapered interior of a sleeve or chuck on a lathe to hold a cylindrical piece of work.", "Horology.the tiny collar that supports the inner terminal of a hairspring."]}, {"Bold_text": "verb (used with object)", "List Items": ["to set (a gem or other stone) in a collet."]}]