Source : Webster's Revised Unabridged Dictionary (1913)

Tumble \Tum"ble\, n.
   Act of tumbling, or rolling over; a fall.

Tumble \Tum"ble\, v. i. [imp. & p. p. {Tumbled}; p. pr. & vb. n.
   {Tumbling}.] [OE. tumblen, AS. tumbian to turn heels over
   head, to dance violently; akin to D. tuimelen to fall, Sw.
   tumla, Dan. tumle, Icel. tumba; and cf. G. taumeln to reel,
   to stagger.]
   1. To roll over, or to and fro; to throw one's self about;
      as, a person on pain tumbles and tosses.

   2. To roll down; to fall suddenly and violently; to be
      precipitated; as, to tumble from a scaffold.

            He who tumbles from a tower surely has a greater
            blow than he who slides from a molehill. --South.

   3. To play tricks by various movements and contortions of the
      body; to perform the feats of an acrobat. --Rowe.

   {To tumble home} (Naut.), to incline inward, as the sides of
      a vessel, above the bends or extreme breadth; -- used esp.
      in the phrase tumbling home. Cf. {Wall-sided}.

Tumble \Tum"ble\, v. t.
   1. To turn over; to turn or throw about, as for examination
      or search; to roll or move in a rough, coarse, or
      unceremonious manner; to throw down or headlong; to
      precipitate; -- sometimes with over, about, etc.; as, to
      tumble books or papers.

   2. To disturb; to rumple; as, to tumble a bed.

Source : WordNet®

tumble
     n 1: an acrobatic feat of rolling or turning end over end
     2: a sudden drop from an upright position; "he had a nasty
        spill on the ice" [syn: {spill}, {fall}]

tumble
     v 1: fall down, as if collapsing; "The tower of the World Trade
          Center tumbled after the plane hit it" [syn: {topple}]
     2: cause to topple or tumble by pushing [syn: {topple}, {tip}]
     3: roll over and over, back and forth
     4: fly around; "The clothes tumbled in the dryer";  "rising
        smoke whirled in the air" [syn: {whirl}, {whirl around}]
     5: fall apart; "the building crimbled after the explosion";
        "Negociations broke down" [syn: {crumble}, {crumple}, {break
        down}, {collapse}]
     6: throw together in a confused mass; "They tumbled the teams
        with no apparent pattern"
     7: understand, usually after some initial difficulty; "She
        didn't know what her classmates were plotting but finally
        caught on" [syn: {catch on}, {get wise}, {get onto}, {latch
        on}, {cotton on}, {twig}, {get it}]
     8: fall suddenly and sharply; "Prices tumbled after the
        devaluation of the currency"
     9: put clothes in a tumbling barrel, where they are whirled
        about in hot air, usually with the purpose of drying;
        "Wash in warm water and tumble dry"
     10: suffer a sudden downfall, overthrow, or defeat
     11: do gymnastics, roll and turn skillfully