Definition from Wiktionary, the free dictionary
tumbler (plural tumblers)
- One who tumbles; one who plays tricks by various motions of the body; an acrobat.
- A movable obstruction in a lock, consisting of a lever, latch, wheel, slide, or the like, which must be adjusted to a particular position by a key or other means before the bolt can be thrown in locking or unlocking.
- A piece attached to, or forming part of, the hammer of a gunlock, upon which the mainspring acts and in which are the notches for sear point to enter.
- A drinking glass that has no stem, foot, or handle — so called because such glasses originally had a pointed or convex base and could not be set down without spilling. This compelled the drinker to finish his measure.
- A variety of the domestic pigeon remarkable for its habit of tumbling, or turning somersaults, during its flight.
- A beverage cup, typically made of stainless steel, that is broad at the top and narrow at the bottom commonly used in India.
- (obsolete) A dog of a breed that tumbles when pursuing game, formerly used in hunting rabbits.
- (UK, Scotland, dialect, obsolete) A kind of cart; a tumbrel.
Related terms 
acrobat — see acrobat
part of a gunlock
drinking glass without stem
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