[{"Bold_text": "noun", "List Items": ["a person who performs leaps, somersaults, and other bodily feats.", "(in a lock) any locking or checking part that, when lifted or released by the action of a key or the like, allows the bolt to move.", "a stemless drinking glass having a flat, often thick bottom.", "(in a gunlock) a leverlike piece that by the action of a spring forces the hammer forward when released by the trigger.", "Machinery.a part moving a gear into place in a selective transmission.a single cog or cam on a rotating shaft, transmitting motion to a part with which it engages.", "a part moving a gear into place in a selective transmission.", "a single cog or cam on a rotating shaft, transmitting motion to a part with which it engages.", "a tumbling box or barrel.", "a person who operates a tumbling box or barrel.", "one of a breed of dogs resembling a small greyhound, used formerly in hunting rabbits.", "Also called roller .one of a breed of domestic pigeons noted for the habit of tumbling backward in flight.", "a toy, usually representing a fat, squatting figure, that is weighted and rounded at the bottom so as to rock when touched.", "a tumbrel or tumble cart."]}]