[{"Bold_text": "noun", "List Items": ["Electricity.a lining for a hole, intended to insulate and protect from abrasion one or more conductors that pass through it.", "Machinery.a replaceable thin tube or sleeve, usually of bronze, mounted in a case or housing as a bearing.a replaceable hardened steel tube used as a guide for various tools or parts, as a drill or valve rod.", "a replaceable thin tube or sleeve, usually of bronze, mounted in a case or housing as a bearing.", "a replaceable hardened steel tube used as a guide for various tools or parts, as a drill or valve rod."]}]