circle change
n.— «That finger, which McBeth cannot straighten, bends perfectly around the ball when he throws what in baseball parlance is called a “circle change” or an “OK change.” The trick to throwing the pitch is to put as little pressure as possible on the index finger and let the other three fingers and thumb guide the ball.» —“Former USC baseball players pitching for major leagues” by Ron Morris in Cincinatti The State (Columbia, South Carolina) June 10, 2007. (source: Double-Tongued Dictionary)
Further reading
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