RhymeZone: tumbler definitions

Definitions of tumbler:

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

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See tumbler used in context: 3 definitions