From parallel lines (facing in or out), waves or two faced lines: All Cast Off (or arm turn) 3/4, then the new centers Trade as the new ends turn back turning away from the center. Waves finish in two faced lines. Lines and two faced lines finish as line facing in or out.
Dewey Berry 1970
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.