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is knuckling

  • present progressive
    of knuckle (3rd person singular).
    knuckle
    noun
    a joint of a finger, especially one of the articulations of a metacarpal with a phalanx.

Example Sentences

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So, now, on the eve of the Olympics, Sharman, a showman in the Usain Bolt mould, is knuckling down and putting his own advice on overcoming adversity into practice.

From The Guardian ● Jul. 25, 2012