tumbler

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tumbler

1. a person, esp a professional entertainer, who performs somersaults and other acrobatic feats
2. 
a. a part that moves a gear in a train of gears into and out of engagement
b. a single cog or cam that transmits motion to the part with which it engages
3. a breed of domestic pigeon kept for exhibition or flying. The performing varieties execute backward somersaults in flight

tumbler

[′təm·blər]
(engineering)
A device in a lock cylinder that must be moved to a particular position, as by a key, before the bolt can be thrown.
A device or mechanism in which objects are tumbled.

tumbler

In a lock, the locking mechanism which detains the bolt until set free by a key.
References in periodicals archive ?
Jackson swallowed it by the tumblerful, and its only effect on him was to make him seem sad and pensive.
The Brazilian Press wanted to know how many of the Scottish team had come straight from their shifts as a postie and they positively boggled at the sight of our 40- year-old goalie in Elton John specs and teeth which had just come out of a tumblerful of Steradent.