knuckle down
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verb
~ knuckles down 3rd person; ~ knuckled down past tense; ~ knuckling down present participle
thesaurus
~ 5 words related to knuckle down as Verb.
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~ knuckles down 3rd person; ~ knuckled down past tense; ~ knuckling down present participle
~ 5 words related to knuckle down as Verb.