NOUN (1)

1. an acrobatic feat in which the trunk is bent backward from a standing position until the hands touch the floor;

The Collaborative International Dictionary of English v.0.48:

backbend \back"bend\ (b[a^]k"b[e^]nd), n.
   1. an acrobatic feat in which the trunk is bent backward from
      a standing position until the hands touch the floor.
      [WordNet 1.5]