tumbling (Noun) — The gymnastic moves of an acrobat.
tumbling (Verb) — Fall down, as if collapsing. ex. "The tower of the World Trade Center tumbled after the plane hit it"
tumbling (Verb) — Cause to topple or tumble by pushing.
tumbling (Verb) — Roll over and over, back and forth.
tumbling (Verb) — Fly around. ex. "The clothes tumbled in the dryer"
tumbling (Verb) — Fall apart. ex. "the building tumbled after the explosion"
tumbling (Verb) — Throw together in a confused mass. ex. "They tumbled the teams with no apparent pattern"
tumbling (Verb) — Understand, usually after some initial difficulty.
tumbling (Verb) — Fall suddenly and sharply. ex. "Prices tumbled after the devaluation of the currency"
tumbling (Verb) — Put clothes in a tumbling barrel, where they are whirled about in hot air, usually with the purpose of drying. ex. "Wash in warm water and tumble dry"
tumbling (Verb) — Suffer a sudden downfall, overthrow, or defeat.
tumbling (Verb) — Do gymnastics, roll and turn skilfully.