tumblers

noun

1. 1.One who tumbles; one who plays tricks by various motions of the body; an acrobat.
2. 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. 3.A rotating device for smoothing and polishing rough objects, placed inside it, on relatively small parts.
4. 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. 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.