tumbler meaning and definition

TUMBLER noun

Definition of tumbler (noun)

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
   • synonyms: roller, tumbler pigeon