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Tumbler is a part of a lock whose position must be changed by a key in order to release the bolt.
See also: Pin tumbler lock, Tubular pin tumbler lock, Disc tumbler lock, shot glass
A Tumbler is also the name of a type of drinkware, a small glass cup, often found in bars and pubs, used to hold alcoholic beverages. So-called because originally it had a pointed or convex base, and could not be set down with any liquor in it, thus compelling the drinker to finish their measure.
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