tumble -- (fall suddenly and sharply; "Prices tumbled after the devaluation of the currency")
tumble -- (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")
tumble -- (suffer a sudden downfall, overthrow, or defeat)
tumble -- (do gymnastics, roll and turn skillfully)