From eight chain thru formation: All Pass Thru then the centers do a left shoulder Pass Thru. Finishes in completed double pass thru formation.
NOTE: An abbreviated form of an old call named "Hey the Line" in which those facing out on the ends looped around to come back in and repeat the right shoulder then the left shoulder pass by.
Virginia Callaghan 1959
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.