tumble - noun

an acrobatic feat of rolling or turning end over end

a sudden drop from an upright position

tumble - verb

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

tumble - thesaurus

collapse   crumble   crumple   fall   spill   tip   topple   twig   whirl