From two parallel waves: Those facing in walk forward and arm turn 3/4 by "non-adjacent" arms then spread apart. Those facing out Split Circulate and step and turn into the nearest center position of new parallel two faced lines.
NOTE: In Criss Cross Your Neighbor, those doing the Split Circulate move to the farthest center positions.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.