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 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.
 * 4) 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.
 * 5) A variety of the domestic pigeon remarkable for its habit of tumbling, or turning somersaults, during its flight.
 * 6) A beverage cup, typically made of stainless steel, that is broad at the top and narrow at the bottom commonly used in India.

Related terms

 * tumble

Thesaurus
acrobat, aerialist, bareback rider, circus artist, clown, contortionist, equestrian director, equilibrist, flier, funambulist, gymnast, high wire artist, high-wire artist, juggler, lion tamer, palaestrian, pancratiast, ringmaster, ropewalker, slack-rope artist, snake charmer, sword swallower, tightrope walker, trapeze artist, weightlifter