From lines facing out: Right-hand couples Cast Off 1/4 and Roll and Extend to become ends as the belle of the other couple does a Shove Off (same as centers Box Circulate in this case) while the beau (in the left-hand couple) slides one position to the right. Ends in 2-faced lines.
This definition is from SCVSDA Note Service by Bill Davis.
It is provided here for informational and educational purposes only.