The American Heritage® Dictionary of the English Language, 4th Edition
n. An acrobatic stunt in which the body rolls forward or backward in a complete revolution with the knees bent and the feet coming over the head. Also called somerset; also called regionally tumbleset.
n. A complete reversal, as of sympathies or opinions.
n. In gymnastics, an act where the gymnast turns head over heels
v. To perform a somersault.
the GNU version of the Collaborative International Dictionary of English
n. A leap in which a person turns his heels over his head and lights upon his feet; a turning end over end.
The Century Dictionary and Cyclopedia
n. A spring or fling in which a person turns heels over head; a complete turn in the air, such as is performed by tumblers.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an acrobatic feat in which the feet roll over the head (either forward or backward) and return
v. do a somersault
Word Usage
"“I know a lot of people are in somersault land,” Representative Rahm Emanuel, Democrat of Illinois and chairman of the Democratic Congressional Campaign Committee, said reproachfully of fellow Democrats."