Dictionary.com
Thesaurus.com

knuckleball

American  
[nuhk-uhl-bawl] / ˈnʌk əlˌbɔl /
Or knuckle ball

noun

Baseball.
  1. 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.


Etymology

Origin of knuckleball

An Americanism dating back to 1905–10

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

"It's one of the knuckleball ones, but he should be saving it. He's made a mistake, but he has been one of the better goalkeepers this season."

From BBC

The Chiefs got a big boost when Dicker botched the ensuing kickoff, booting a knuckleball that failed to reach the landing zone, thereby allowing Kansas City to begin the final drive on its 40-yard line.

From Los Angeles Times

He would strike 'knuckleballs', where rather than the ball spiralling through the air cleanly, it would wobble erratically.

From BBC

Boston is wearing heart-shaped No. 49 patches in honor of the knuckleball pitcher this season.

From Seattle Times

Though when he saw George Kirby unleash a nasty knuckleball in the last game of the season, Gilbert was more than amused.

From Seattle Times