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