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knuckleball

or knuck·le ball

[ nuhk-uhl-bawl ]
/ ˈnʌk əlˌbɔl /
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noun Baseball.
a junk 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: Trying to hit his knuckleball was like swatting at a fly with a straw.
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Also called knuck·ler [nuhk-ler]. /ˈnʌk lər/.

Origin of knuckleball

An Americanism dating back to 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use knuckleball in a sentence

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