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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
   - roller, tumbler pigeon

Derived forms: tumblers

Type of: domestic pigeon, drinking glass, glass, gymnast, impediment, impedimenta, obstructer, obstruction, obstructor

Part of: lock

Encyclopedia: Tumbler