A tumbler is a flat-floored beverage container usually made of plastic, glass or stainless steel.

Types of tumblers include the following:

• Collins glass, for a tall mixed drink^[1]
• Dizzy Cocktail glass, a glass with a wide, shallow bowl, comparable to a normal cocktail glass but without the stem
• Highball glass, for mixed drinks^[2]
• Iced tea glass
• Juice glass, for fruit juices and vegetable juices.
• Old fashioned glass, traditionally, for a simple cocktail or liquor "on the rocks". Contemporary American "rocks" glasses may be much larger, and used for a variety of beverages over ice
• Shot glass, a small glass for up to four ounces of liquor. The modern shot glass has a thicker base and sides than the older whiskey glass
• Table glass, faceted glass, or granyonyi stakan, common in Russia and made of particularly hard and thick glass
• Water glass
• Whiskey tumbler, a small, thin-walled glass for a straight shot of liquor

Theories vary as to the etymology of the word tumbler. One such theory is that the glass originally had a pointed or convex base and could not be set down without spilling. Another is that they had weighted bottoms which caused them to right themselves if knocked over.^[3]

Originally, the term tumbler referred to a type of drinking glass with a pointed or rounded base, which prevented it from being put down until it was empty, encouraging the drinker to finish their beverage in one go.^{[citation needed]} This design feature was not only a practical solution to the lack of flat surfaces in medieval times but also a novel way to ensure guests consumed their drinks quickly at gatherings. Over time, the design evolved into the flat-bottomed glassware we are familiar with today, which can comfortably sit on tables and counters without tipping over.^{[citation needed]} The modern tumbler comes in various sizes and shapes, designed to accommodate a wide range of beverages from water and juice to sophisticated cocktails, showcasing its evolution from a functional necessity to a staple of everyday life and celebratory occasions alike.^[4] Tumblers can also be adorned with decor, such as gemstones and rhinestones.^[5]

Look up tumbler in Wiktionary, the free dictionary.

• The Jana Sena Party from India has been assigned a glass tumbler as a common election symbol.^[6]