Active man leads partner (with inside hands still held) through the couple to the right ("First gent take his lady by the wrist, and through that couple with a Grapevine Twist"), go around the lady, back to the center of the set, traveling clockwise around the inside to lead his partner back through the same outside couple to walk around the man. He leads his partner clockwise around the inside of the set and joins hands with the outside line of four between the next couple to the right to repeat the routine. Then on to couple four with a line of six to do it again.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.