Knuckle-ball meaning

nŭkəl-bôl
A slow pitch that has almost no spin and veers erratically, thrown by gripping the ball with the nails or knuckles near the tips of the index and middle fingers, and often the third finger.
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(baseball) A slow pitch without spin thrown with the first knuckles, or the nails, of the middle two or three fingers pressed against the ball.
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