TUMBLER

Definition

1. noun a gymnast who performs rolls and somersaults and twists etc..
2. noun a glass with a flat bottom but no handle or stem.
3. noun 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. noun pigeon that executes backward somersaults in flight or on the ground. — synonyms: roller, tumbler_pigeon