apply oneself, try hard, labor, set to work; see apply (oneself), concentrate 2, work 1.
"knuckle-down." YourDictionary, n.d. Web. 16 January 2019. <https://thesaurus.yourdictionary.com/knuckle-down>.
knuckle-down. (n.d.). Retrieved January 16th, 2019, from https://thesaurus.yourdictionary.com/knuckle-down
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