tum·ble /ˈtʌmbəl/
 跌倒,摔跤,翻斤斗(vi.)翻倒,摔倒,倒塌,滾動,翻斤斗,倉促地行動(vt.)使摔倒
 Tum·ble v. i. [imp. & p. p. Tumbled p. pr. & vb. n. Tumbling ]
 1. To roll over, or to and fro; to throw one's self about; as, a person in 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.
 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.
 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.
 Tum·ble, n. Act of tumbling, or rolling over; a fall.
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 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]
      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