Tumbler

From Wikipedia, the free encyclopedia.

Tumbler is a part of a lock whose position must be changed by a key in order to release the bolt.

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.