tumbler

名词 tumbler:

1. a gymnast who performs rolls and somersaults and twists etc.
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. pigeon that executes backward somersaults in flight or on the ground
   同义词：roller, tumbler pigeon

1. He drank up a tumbler of milk.
   他喝光了一玻璃杯牛奶。
2. He was a tumbler when he was young.
   他年轻时是个翻筋斗的杂技演员。