Source : Webster's Revised Unabridged Dictionary (1913)

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}.