Tumbler - Definition
tumbler
n 1: a gymnast who performs rolls and somersaults and twists
etc.
2: a glass with a flat bottom but no handle or stem; originally
had a round bottom
3: a movable obstruction in a lock that must be adjusted to a
given position (as by a key) before the bolt can be thrown
4: pigeon that executes backward somersaults in flight or on the
ground [syn: roller, tumbler, tumbler pigeon]