tumbler

tumbler
    n 1: a gymnast who performs rolls and somersaults and twists
         etc.
    2: a glass with a flat bottom but no handle or stem; originally
       had a round bottom
    3: a movable obstruction in a lock that must be adjusted to a
       given position (as by a key) before the bolt can be thrown
    4: pigeon that executes backward somersaults in flight or on the
       ground [syn: {roller}, {tumbler}, {tumbler pigeon}]
    

Tumbler \Tum"bler\, n.
   1. One who tumbles; one who plays tricks by various motions
      of the body; an acrobat.
      [1913 Webster]

   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.
      [1913 Webster]

   3. (Firearms) 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 the sear point to enter.
      [1913 Webster]

   4. A drinking glass, without a foot or stem; -- so called
      because originally it had a pointed or convex base, and
      could not be set down with any liquor in it, thus
      compelling the drinker to finish his measure.
      [1913 Webster]

   5. (Zool.) A variety of the domestic pigeon remarkable for
      its habit of tumbling, or turning somersaults, during its
      flight.
      [1913 Webster]

   6. (Zool.) A breed of dogs that tumble when pursuing game.
      They were formerly used in hunting rabbits.
      [1913 Webster]

   7. A kind of cart; a tumbrel. [Prov. Eng. & Scot.]
      [1913 Webster]
    

25 Moby Thesaurus words for "tumbler":
      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