adj. 翻滚，滚磨（表面光滑或稍微粗糙，边角光滑且呈破碎状）
v. 翻到，滚动（tumble的过去分词）

Tumble \Tum"ble\, v. i. [imp. & p. p. {Tumbled}; p. pr. & vb. n.
{Tumbling}.] [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 on pain tumbles and tosses.

2. To roll down; to fall suddenly and violently; to be
precipitated; as, to tumble from a scaffold.

He who tumbles from a tower surely has a greater
blow than he who slides from a molehill. --South.

3. To play tricks by various movements and contortions of the
body; to perform the feats of an acrobat. --Rowe.

{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}.