| knuckle | (noun) a joint of a finger when the fist is closed | Synonyms: knuckle joint, metacarpophalangeal joint |
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| (verb) press or rub with the knuckles | - |
| (verb) shoot a marble while keeping one's knuckles on the ground | - |
| knuckleball | (noun) a baseball pitch thrown with little speed or spin | Synonyms: knuckler |
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| knucklebones | (noun) a game in which jackstones are thrown and picked up in various groups between bounces of a small rubber ball | Synonyms: jacks, jackstones |
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| knucklehead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| knuckler | (noun) a baseball pitch thrown with little speed or spin | Synonyms: knuckleball |
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| knuckles | (noun) (used in the plural) a small metal weapon; worn over the knuckles on the back of the hand | Synonyms: brass knuckles, brass knucks, knuckle duster, knucks |
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| knucks | (noun) (used in the plural) a small metal weapon; worn over the knuckles on the back of the hand | Synonyms: brass knuckles, brass knucks, knuckle duster, knuckles |
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