<p><strong>Noun</strong></p><ul><li>a person who performs leaps, somersaults, and other bodily feats</li><li>(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</li><li>a stemless drinking glass having a flat, often thick bottom</li><li>(in a gunlock) a leverlike piece that by the action of a spring forces the hammer forward when released by the trigger</li><li>Machinery: a part moving a gear into place in a selective transmission</li><li>a single cog or cam on a rotating shaft, transmitting motion to a part with which it engages</li><li>a tumbling box or barrel</li><li>a person who operates a tumbling box or barrel</li><li>one of a breed of dogs resembling a small greyhound, used formerly in hunting rabbits (also called roller)</li><li>one of a breed of domestic pigeons noted for the habit of tumbling backward in flight</li><li>a toy, usually representing a fat, squatting figure, that is weighted and rounded at the bottom so as to rock when touched</li><li>a tumbrel or tumble cart</li></ul>