a person who performs leaps, somersaults, and other bodily feats.
(in a lock) any locking or checking part that, when lifted or released by the action of a key or the like, allows the bolt to move.
a stemless drinking glass having a flat, often thick bottom.
(in a gunlock) a leverlike piece that by the action of a spring forces the hammer forward when released by the trigger.
a part moving a gear into place in a selective transmission.
a single cog or cam on a rotating shaft, transmitting motion to a part with which it engages.
a tumbling box or barrel.
a person who operates a tumbling box or barrel.
one of a breed of dogs resembling a small greyhound, used formerly in hunting rabbits.
Also called roller. one of a breed of domestic pigeons noted for the habit of tumbling backward in flight.
a toy, usually representing a fat, squatting figure, that is weighted and rounded at the bottom so as to rock when touched.
a tumbrel or tumble cart.

1300–50; Middle English: acrobat; see tumble, -er1. Compare Low German tümeler drinking-cup, kind of pigeon

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tumbler (ˈtʌmblə)
1.  a.  a flat-bottomed drinking glass with no handle or stem. Originally, a tumbler had a round or pointed base and so could not stand upright
 b.  Also called: tumblerful the contents or quantity such a glass holds
2.  a person, esp a professional entertainer, who performs somersaults and other acrobatic feats
3.  another name for tumble dryer
4.  Also called: tumbling box a pivoted box or drum rotated so that the contents (usually inferior gemstones) tumble about and become smooth and polished
5.  the part of a lock that retains or releases the bolt and is moved by the action of a key
6.  a lever in a gunlock that receives the action of the mainspring when the trigger is pressed and thus forces the hammer forwards
7.  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
8.  a toy, often a doll, that is so weighted that it rocks when touched
9.  (often capital) a breed of domestic pigeon kept for exhibition or flying. The performing varieties execute backward somersaults in flight

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

mid-14c., "acrobat," from tumble (v.). A fem. form was tumbester (late 14c.). Meaning "drinking glass" is recorded from 1660s, originally a glass with a rounded or pointed bottom which would cause it to "tumble," and thus it could not be set down until it was empty.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The odds are good that tumbler on your table contains water that came from an
  underground aquifer.
At the end of the drying cycle, aeration air leaving the drying tumbler vents
  to atmosphere.
Provide door with tumbler lock with key and full length piano hinge.
Presents several examples of getting misled by the candle and tumbler
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