/'tʌmblə(r); `tʌmblɚ/
n
1 (a) flat-bottomed straight-sided drinking-glass with no handle or stem （无柄、无脚、平底、直壁的）玻璃杯. =>illus at glass 见 glass 插图.
(b) (also tumblerful / -fUl; -fJl/) amount held by a tumbler 一玻璃杯的容量
*a tumbler of milk 一玻璃杯牛奶.
2 part of a lock that holds the bolt until lifted by a key （锁的）制栓（用钥匙开启锁栓的部件）.
3 acrobat who turns somersaults, esp on the ground 翻筋斗的杂技演员（尤指在地面上的）.

n[C]

[Date: 1300-1400; Origin: tumble;]
[Sense: 1-2; Origin: because it was originally made with a round or pointed bottom]
a glass with a flat bottom and no handle
alsotumblerful [-ful/