Definitions of tumble:

• noun:   an acrobatic feat of rolling or turning end over end
• noun:   a sudden drop from an upright position
• verb:   put clothes in a tumbling barrel, where they are whirled about in hot air, usually with the purpose of drying

  Example: "Wash in warm water and tumble dry"

• verb:   fall suddenly and sharply

  Example: "Prices tumbled after the devaluation of the currency"

• verb:   do gymnastics, roll and turn skillfully
• verb:   throw together in a confused mass

  Example: "They tumbled the teams with no apparent pattern"

• verb:   roll over and over, back and forth
• verb:   fall down, as if collapsing

  Example: "The tower of the World Trade Center tumbled after the plane hit it"

• verb:   suffer a sudden downfall, overthrow, or defeat
• verb:   fly around

  Example: "The clothes tumbled in the dryer"

• verb:   cause to topple or tumble by pushing
• verb:   fall apart
• verb:   understand, usually after some initial difficulty