To turn over; to turn or throw about, as for examination or search; to roll or move in a rough, coarse, or unceremonious manner; to throw down or headlong; to precipitate; -- sometimes with over, about, etc.; as, to tumble books or papers.
Act of tumbling, or rolling over; a fall.
an acrobatic feat of rolling or turning end over end
fall down, as if collapsing; "The tower of the World Trade Center tumbled after the plane hit it"
roll over and over, back and forth
fall apart; "the building crimbled after the explosion"; "Negociations broke down"
throw together in a confused mass; "They tumbled the teams with no apparent pattern"
fall suddenly and sharply; "Prices tumbled after the devaluation of the currency"
do gymnastics, roll and turn skillfully