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Definition of Knuckle down
1. Verb. Work very hard, like a slave.
Exact synonyms: Break One's Back, Buckle Down, Slave
Generic synonyms: Do Work, Work
Derivative terms: Slave, Slavery
Generic synonyms: Do Work, Work
Derivative terms: Slave, Slavery
Definition of Knuckle down
1. Verb. (intransitive chiefly British idiomatic) To get to work; to focus on a task. ¹
¹ Source: wiktionary.com