knuckler
Baseball slang for a knuckleball — the notoriously unpredictable pitch thrown with the knuckles or fingertips that barely spins and moves in chaotic, dancing patterns that confuse even the pitcher throwing it.
Definitions
Baseball slang for a knuckleball — the notoriously unpredictable pitch thrown with the knuckles or fingertips that barely spins and moves in chaotic, dancing patterns that confuse even the pitcher throwing it. A knuckler is one of the rarest pitches in pro baseball because it's so hard to control and so hard to hit. Pitchers who master the knuckler can have unusually long careers because the pitch doesn't strain the arm like fastballs do. It's the unicorn pitch of baseball, loved and feared in equal measure.
He threw a knuckler in the full count and the batter swung at a pitch that broke six inches outside.
Comments
(baseball, _, slang) A knuckleball.
"knuckler" means: A knuckleball.. This is informal slang, common in casual speech, texting and social media, but not appropriate for school work, applications or professional settings. There is no real cause for concern in itself; it is everyday peer vocabulary. If your child uses it, a light comment about audience and register is usually enough — no need to escalate. Context, more than the word, tells you whether to follow up.
"knuckler" means: A knuckleball.. Register: informal slang, fine in casual conversation, texting and social media but not in academic essays, business writing or formal speech. A common non-native mistake is to use the word in the wrong register, or to assume one fixed meaning when it is actually polysemous; always check the surrounding register and the audience before producing it yourself. In formal writing, prefer a neutral synonym or a short descriptive phrase, and use this word only when you have heard or read it being used naturally in a comparable context.
“And I think you are pulling a strawman argument, Horse Knuckler”
— Bluesky· May 2026
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