From eight chain thru formation or parallel waves: Spin Chain Thru 1/4--all arm turn half. Spin Chain Thru 1/2--All arm turn 1/2 then centers arm turn 3/4. Spin Chain Thru 3/4--All arm turn 1/2, then centers arm turn 3/4 and the centers in the wave across the center Trade.
Gus Greene
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.