Note: Different use of "Snap."
From eight chain thru formation: Couples start to circle left, but the man in the center couple lets go with his left hand as the other man makes an arch holding his right hand high and pivots in place to let his partner back up under the arch. Finishes in lines facing out.
Henry Cosimini 1974
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.