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 classic literature ?
The next two tumblers crossed the sawdust and were helped by Collins up to the imaginary stage.
Unfortunately, one young Italian, Peter, an impish soul, seeing me sitting solitary, stirred by a whim of the moment, half-filled a tumbler with wine and passed it to me.
A boy came up whistling and leaving papers on the mats; it was getting on for eight o'clock, and the whiskey and soda of half-past twelve stood untouched and stagnant in the tumbler.
No, no, it's of no use my talking to you about tumblers.
Richard Swiveller, who had been looking over the rim of the tumbler while his companion addressed the foregoing remarks to him with great energy and earnestness of manner, no sooner heard these words than he evinced the utmost consternation, and with difficulty ejaculated the monosyllable:
He sat doggedly down in his chair, and began sullenly sipping his tumbler of punch.
Upon which he poured it out of a jug into a large tumbler, and held it up against the light, and made it look beautiful.
So I think," said Sancho; "but now tell me, who was the first tumbler in the world?
he concluded, drinking a tumbler of wine with dignity and looking to the count for approval.
Seal, on the landing outside the office, inducing a very large dog to drink water out of a tumbler.
There was an extra bed in it tonight, very near my own, but differently shaped, and scarcely less conspicuous was the new mantel-shelf ornament: a tumbler of milk, with a biscuit on top of it, and a chocolate riding on the biscuit.
His companion was in the act of raising his to his lips when the ship gave a roll, his elbow caught the back of a chair, and the tumbler slipped from his fingers.