tumbling

tumbling (http://definr.com/tumbling)

     adj 1: moving in surges and billows and rolls; "billowing smoke
            from burning houses"; "the rolling fog"; "the rolling
            sea"; "the tumbling water of the rapids" [syn: billowing,
             rolling]
     2: pitching headlong with a rolling or twisting movement; "a
        violent tumbling fall"
     n : the gymnastic moves of an acrobat [syn: acrobatics]