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

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.

See also: shot glass

A tumbler is a toy that can tumble over and then straighten up itself. It usually has a rounded base with a heavy weight at the lowermost part of it.