Apply oneself seriously to a task.
- However, when there is work to be done he insists that you knuckle down and we know the time to be serious.
- I have to give him credit for really knuckling down to his training and he cannot wait to get back into the ring.
- I at least had the satisfaction of startling the idiot out of his numb trance before I knuckled down to the task at hand.
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