From one quarter tag formation: All do a Jay Walk (those in the wave Step Thru then Pass Thru with the outsides as the new centers move into a left hand wave). The wave does a Left Swing Thru and then arm turn 3/4 as those facing out Quarter Left and Circulate two positions. Finishes as parallel left hand waves.
NOTE: If the starting wave in the centers is left hand, then the ending formation is parallel two faced lines.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.