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knuckle ball

or knuckleball

noun, Baseball.
1.
a slow pitch that moves erratically toward home plate, usually delivered by holding the ball between the thumb and the knuckles of the first joints of the first two or three fingers.
Also called knuckler
[nuhk-ler] /ˈnʌk lər/ (Show IPA)
.
Origin of knuckle ball
1905-1910
An Americanism dating back to 1905-10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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