tumbler

A tumbler is a word with a few common uses. Most often, it means a sturdy drinking glass, the kind you might use for water, juice, or whiskey. It can also mean an acrobat who does flips and somersaults. In locks, tumblers are the small moving parts inside that must line up before the lock can open. The word is also used for a clothes dryer that turns clothes around as they dry. In many of these meanings, the idea of turning or moving is an important part of the story.

The word "tumbler" has developed several meanings over time, and many of them connect to the idea of turning, rolling, or flipping. In earlier English, a tumbler was an acrobat or performer who did flips and rolls. That sense of movement also helps explain the drinking glass. Long ago, some drinking vessels called tumblers had rounded or pointed bottoms, so they could tip over if they were set down carelessly or before they were empty.

Today, the most common meaning is still the drinking glass, now usually with a flat bottom. But the word also appears in mechanical settings. In a lock, a tumbler is one of the small pins or levers inside that must move into the right position before the lock opens. The word can also refer to a clothes dryer, especially one that dries clothes by turning them around in a drum. There is even a breed of pigeon called a tumbler, named for its rolling or flipping movement in the air. So while the meanings may seem different at first, they are tied together by a shared sense of motion.