tumbler tumbler /ˈtʌmblɝ/

noun

1. () A glass with a flat bottom but no handle or stem; originally had a round bottom  ( tumbler )
   a glass with a flat bottom but no handle or stem; originally had a round bottom
    He drank a glass of water from a tumbler
   He drank a glass of water from a tumbler
   
   
2. () A gymnast who performs rolls and somersaults and twists etc.  ( tumbler )
   a gymnast who performs rolls and somersaults and twists etc.
    The tumbler executed a flawless series of somersaults during the gymnastics competition.
   The tumbler executed a flawless series of somersaults during the gymnastics competition.
   
   
3. Pigeon that executes backward somersaults in flight or on the ground  ( roller , tumbler , tumbler pigeon )
   pigeon that executes backward somersaults in flight or on the ground
   
   
4. A movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown  ( tumbler )
   a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown