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| knuck·le·ball [ núk'l bàwl ] (plural knuck·le·balls) |
noun |
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| Definition: |
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unpredictable pitch in baseball: in baseball, a slow pitch with little spin and an unpredictable flight, produced by releasing the ball from the knuckles and the thumb or the tips of two or three fingers
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  knuck·le·ball·er noun |
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