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WordNet-Online 
 Definitions from WordNet | ||||
| Definitions from the WebDefinitionKnuckle under is a phrasal verb which means to submit, surrender, or yield to someone or something due to pressure or intimidation. Senses and Usages
 Sample Sentences
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| knuckl knuckle-dragger knuckle knuckle  knuckle down knuckle duster knuckle joint knuckle press knuckle under knuckleball knucklebones knucklehead knuckler knuckles knuckly knucks knucle 
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