From parallel two faced lines: The couples facing in face each other on the diagonal and Star Thru. Those facing out Cast Off 3/4 (about) and fall in behind the others in double pass thru formation. Other finishing formations are possible, but dancers must adjust somewhat to make square corners.
Dick Bayer 1972
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.