Two single files of two facing each other (or double pass thru formation): Those facing do a Turn Thru, then a Left Turn Thru the outside two, go back to the middle and Turn Thru again. Finishes in two single files of two back to back (or completed double pass thru formation).
George Jowdy 1967
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.