Rollaway is the same as

"Rollaway with a Half Sashay" or "Ladies Rollaway".

From a couple.

Exchange places by having the Beau (right-side dancer) sidestep behind the Belle (left-side dancer) as the Belle does a 360 degree turn to the left to end in the Beau's original starting position.

Ends in a couple.

To do 1/2 of a Rollaway, the Beau sidesteps 1/2 of a position while slightly moving backward, as the Belle does a 180 degree turn to the left while moving 1/2 of a position toward the Beau. Ends in facing dancers. "1/2 of a Rollaway" is similar to "Belles Fold".