[n] a sudden drop from an upright position; "he had a nasty spill on the ice"
[n] an acrobatic feat of rolling or turning end over end
[v] do gymnastics, roll and turn skillfully
[v] suffer a sudden downfall, overthrow, or defeat
[v] put clothes in a tumbling barrel, where they are whirled about in hot air, ususally with the purpose of drying; "Wash in warm water and tumble dry"
[v] fall suddenly and sharply; "Prices tumbled after the devaluation of the currency"
[v] understand, usually after some initial difficulty
[v] throw together in a confused mass; "They tumbled the teams with no apparent pattern"
[v] roll over and over, back and forth
[v] fall down, as if collapsing
[v] fall apart; also used metaphorically; "Negociations broke down"
[v] fly around, as of paper on the sidewalk, or clothes in a dryer, or rising smoke in the wind
[v] cause to topple or tumble by pushing
break down, catch on, collapse, cotton on, crumble, crumple, fall, get it, get onto, latch on, skirl, spill, topple, twig, whirl, whirl around