When someone does a runback, they run back to where they started from.
Runbacks are usually done in games or sports.
Examples:
After he got the ball, he did a runback to the other side of the field.
The runback in the game was really fast.
She did a runback and scored a point for her team.
The runback made everyone cheer.
The runback was so quick, it was like lightning.
He did a runback and won the game.