The American Heritage® Dictionary of the English Language, 4th Edition
n. A Japanese form of wrestling in which a fighter loses if forced from the ring or if any part of his body except the soles of his feet touches the ground.
n. a stylised Japanese form of wrestling in which a wrestler loses if he is forced from the ring, or if any part of his body except the soles of his feet touch the ground.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a Japanese form of wrestling; you lose if you are forced out of a small ring or if any part of your body (other than your feet) touches the ground