From one quarter tag formation: Those in the center wave step forward and arm turn the outside couples half. Leave the outside couples facing out and come back to the center and re-form a wave. Finishes in 3/4 Tag formation.
COMMENT: This movement is called simply Scoot Back.
Wes Wessinger 1973
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.