名词

1. (平底)玻璃杯
A tumbler is a drinking glass with straight sides.

2. （在地上表演的）杂技演员;翻筋斗杂技演员
A tumbler is an acrobat who performs on the ground, often with other members of a group.

1. pigeon that executes backward somersaults in flight or on the ground

Synonym: rollertumbler pigeon

2. a glass with a flat bottom but no handle or stem
originally had a round bottom

3. a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown

4. a gymnast who performs rolls and somersaults and twists etc.