From Longman Dictionary of Contemporary Englishtumblingtum‧bling /ˈtʌmblɪŋ/ noun [uncountable] DSOa sport similar to gymnastics but with all the exercises done on the floor
Examples from the Corpus
tumbling• The momentum often subsides, leading to a tumbling of the share price.• Several more items come tumbling or fluttering out over me ... A dentist's appointment card.• The two guys near the bottom fell tumbling and Ember hit the first one hard on the neck.• Jack and Jill went up the hill, yes, and Jack fell down with Jill tumbling after also.• Whereupon, lo! the animals began coming over, tumbling and falling to their deaths.• I walked on, following the windings of the splashing tumbling Mosedale Beck.• Jones won the race fractionally to poke the ball well wide of goal, but then went tumbling. 