"tumbler" in the noun sense

1. tumbler

a gymnast who performs rolls and somersaults and twists etc.

2. tumbler

a glass with a flat bottom but no handle or stem originally had a round bottom

3. 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

4. roller, tumbler, tumbler pigeon

pigeon that executes backward somersaults in flight or on the ground

Source: WordNet® (An amazing lexical database of English)

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