From facing lines: Ends Pass Thru, move around the outside, pass a second dancer, keep moving and then Pass In with the third dancer. Center four meanwhile Spin the Top and Step Thru. All now Slide Thru. Finishes in lines facing, back to back or with other facings depending on the distribution of sexes for the Slide Thru.
Jim Harlow 1975
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.