v fall down, as if collapsing
v cause to topple or tumble by pushing
v roll over and over, back and forth
v fly around
v fall apart
v throw together in a confused mass
v understand, usually after some initial difficulty
v fall suddenly and sharply
v put clothes in a tumbling barrel, where they are whirled about in hot air, usually with the purpose of drying
v suffer a sudden downfall, overthrow, or defeat
v do gymnastics, roll and turn skillfully