to roll over, or to and fro; to throw one's self about; as, a person on pain tumbles and tosses.-to roll down; to fall suddenly and violently; to be precipitated; as, to tumble from a scaffold.-to play tricks by various movements and contortions of the body; to perform the feats of an acrobat.-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.-to disturb; to rumple; as, to tumble a bed.-act of tumbling, or rolling over; a fall.