Designated dancers walk forward in a small arc into adjacent dancer's position (reversing facing direction) as adjacent dancer slides or side-steps into the runner's vacated position without turning. Those doing the run will always move around a contrasting person--Ends run around centers; centers run around ends; girls run around boys; boys run around girls. In lines or waves, the runners remain in their own half of that line or wave.
Vern Smith and John Ward 1963
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.