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|present participle||knuckling down|
|past tense||knuckled down|
|past participle||knuckled down|
|present participle||knuckling under|
|past tense||knuckled under|
|past participle||knuckled under|
This is the American English definition of knuckle. View British English definition of knuckle.
in competitive cycling, the illegal use of motors on bikes in order to gain advantage over other ridersBuzzWord Article
be reversed; be as if it had never happenedadd a word
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