From the left or right half of a one quarter tag formation: Center two do a (modified) Scoot Back with the outside two, then the centers arm turn half. The dancers facing out do a Quarter Right, then "move up" (on their own side of the set) to form a two faced line in the center. From a full one quarter tag formation, finishes in a line of eight with couples alternately facing.
Jack Lasry 1972
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.