tum‧bler /ˈtʌmblə $ -ər/ noun [countable]
[Date: 1300-1400; Origin: tumble; ]
[Sense 1-2: Origin: because it was originally made with a round or pointed bottom]

1. a glass with a flat bottom and no handle

2. (also tumblerful /-fʊl/ British English) the amount of liquid that this type of glass can contain

3. old-fashioned someone who performs special movements such as doing somersaults (=a jump in which you turn over completely in the air) Synonym : acrobat

[TahlilGaran] Dictionary of Contemporary English ▲