Swing

A bowling style usually employed by fast and medium-pace bowlers. The fielding side will polish the ball on one side of the seam only; as the innings continues, the ball will become worn on one side, but shiny on the other. When the ball is bowled with the seam upright, the air will travel faster over the shiny side than the worn side. This makes the ball swing (curve) in the air, usually after pitching. Conventional swing would mean that the ball curves in the air away from the shiny side. (see reverse swing).