From parallel two-faced lines: The couple facing out Wheel Across and Bend the Line. The couple facing in does a half Wheel Across and then walks straight ahead to form one end of new parallel two-faced lines. Finishes in parallel two-faced lines at right angles to the original ones (those who faced out originally now face in and vice versa).
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.