backfall

from The Century Dictionary.

• noun In wrestling, a fall or trip-up in which a wrestler is thrown upon his back.
• noun In music, an obsolete melodic decoration, nearly like the modern long appoggiatura: called a double backfall when prolonged.
• noun In organ-building, a lever whose front end is raised by the motion of a digital or pedal transmitted through a sticker (which see), its back end being correspondingly depressed: a device for transforming upward motion into downward.

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

• noun A fall or throw on the back in wrestling.

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

• noun A fall or throw on the back in wrestling.