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Wordnet 3.0

NOUN (1)

1. the gymnastic moves of an acrobat;
[syn: acrobatics, tumbling]

The Collaborative International Dictionary of English v.0.48:

Tumble \Tum"ble\ (t[u^]m"b'l), v. i. [imp. & p. p. Tumbled (t[u^]m"b'ld); p. pr. & vb. n. Tumbling (t[u^]m"bl[i^]ng).] [OE. tumblen, AS. tumbian to turn heels over head, to dance violently; akin to D. tuimelen to fall, Sw. tumla, Dan. tumle, Icel. tumba; and cf. G. taumeln to reel, to stagger.] 1. To roll over, or to and fro; to throw one's self about; as, a person in pain tumbles and tosses. [1913 Webster] 2. To roll down; to fall suddenly and violently; to be precipitated; as, to tumble from a scaffold. [1913 Webster] He who tumbles from a tower surely has a greater blow than he who slides from a molehill. --South. [1913 Webster] 3. To play tricks by various movements and contortions of the body; to perform the feats of an acrobat. --Rowe. [1913 Webster] To tumble home (Naut.), to incline inward, as the sides of a vessel, above the bends or extreme breadth; -- used esp. in the phrase tumbling home. Cf. Wall-sided. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Tumbling \Tum"bling\, a. & vb. n. from Tumble, v. [1913 Webster] Tumbling barrel. Same as Rumble, n., 4. Tumbling bay, an overfall, or weir, in a canal. [1913 Webster] Tumbrel
WordNet (r) 3.0 (2006):

tumbling n 1: the gymnastic moves of an acrobat [syn: acrobatics, tumbling]