The effect on the cue ball where the ball is hit without topspin, backspin or sidespin.
Williams will need a lot of stun to avoid going in the middle pocket
verb
1
To incapacitate; especially by inducing disorientation or unconsciousness.
Bill tried to stun the snake by striking it on the head.
2
To shock or surprise.
He stood there stunned, looking at the beautiful, breath-taking sunrise.
3
To hit the cue ball so that it slides without topspin or backspin (and with or without sidespin) and continues at a natural angle after contact with the object ball