From one pair behind another pair: Lead pair individually roll away from each other and behind the trailing pair to finish facing in original direction. Trailing pair steps forward and does a Partner Trade. Finishes as facing pairs.
COMMENT: This call preceded the invention of Zoom (see the Mainstream List). It can now be done directionally by calling "Zoom And Partner Trade."
Vince Spillane 1969
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.