tumbler

noun

1. One who tumbles; one who plays tricks by various motions of the body; an acrobat.

2. 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.

3. A rotating device for smoothing and polishing rough objects, placed inside it, on relatively small parts.

4. 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.

5. 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.

6. A variety of the domestic pigeon remarkable for its habit of tumbling, or turning somersaults, during its flight.

7. A beverage cup, typically made of stainless steel, that is broad at the top and narrow at the bottom commonly used in India.

8. A dog of a breed that tumbles when pursuing game, formerly used in hunting rabbits.

9. A kind of cart; a tumbril.

10. The pupa of a mosquito.

11. One of a set of levers from which the heddles hang in some looms.

12. A porpoise.

13. (cryptocurrency) A service that mixes potentially identifiable or 'tainted' cryptocurrency funds with others, so as to obscure the audit trail.