tumble

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To perform acrobatic feats such as somersaults, rolls, or twists.
• intransitive verb To fall, roll, or move end over end.
• intransitive verb To spill, roll out, or emerge in confusion or disorder.
• intransitive verb To pitch headlong; fall.
• intransitive verb To move quickly or awkwardly.
• intransitive verb To hang down.
• intransitive verb To collapse.
• intransitive verb To undergo a decline in position, status, or fortune.
• intransitive verb To decrease.
• intransitive verb To come upon accidentally; happen on.
• intransitive verb Slang To come to a sudden understanding; catch on.
• intransitive verb To cause to fall or collapse; bring down.
• intransitive verb To put, spill, or toss haphazardly.
• intransitive verb To toss or whirl in a drum, tumbler, or tumbling box.
• intransitive verb To cause to lose position, status, or fortune.
• noun An act of tumbling; a fall.
• noun A decrease, as in value.
• noun A confused or disordered collection or amount of something.

from The Century Dictionary.

• noun A fall; a rolling or turning over; a somersault.
• noun A state of entanglement or confusion.
• noun Same as tumbling-box.
• To roll about by turning one way and another; toss; pitch about; wallow: as, he tumbles and tosses from pain; the tumbling sea.
• To lose footing or support and fall to the ground; come down suddenly and violently; be precipitated; as, to tumble from a scaffold.
• To move or go in a rough, careless, or headlong manner.
• To play mountebank tricks by various springs, balancings, posturings, and contortions of the body.
• To dance.
• To fall rapidly, as prices: as, fancy stocks have tumbled.
• To turn in; go to bed.
• Nautical to come up hastily and in a scrambling way through the hatchway on a ship's deck, as a sailor or a number of sailors together: as, the starboard watch tumbled up.
• To turn over; toss about as for examination or search; revolve in one's mind: usually with over.
• To disorder; rumple: as, to tumble bedclothes.
• To throw by chance or with violence; fling; pitch.
• To bring down; overturn or overthrow; cast to the ground; fling headlong.
• To polish by revolution in a tumbling-box.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb 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..
• transitive verb To disturb; to rumple.
• noun Act of tumbling, or rolling over; a fall.
• intransitive verb To roll over, or to and fro; to throw one's self about.
• intransitive verb To roll down; to fall suddenly and violently; to be precipitated.
• intransitive verb To play tricks by various movements and contortions of the body; to perform the feats of an acrobat.
• intransitive verb (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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A fall
• verb intransitive To fall end over end.
• verb To perform gymnastics such as somersaults, rolls, and handsprings.
• verb To roll over and over.
• verb informal To have sexual intercourse.
• verb transitive To smooth and polish a rough surface on relatively small parts.
• verb To muss, to make disorderly to tousle.