What is the meaning of knuckle down?

verb

WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). knuckle down. Retrieved September 20, 2026, from http://smartdefine.org/knuckle_down/definitions/1289862
ChicagoWordNet. 2010. "knuckle down" http://smartdefine.org/knuckle_down/definitions/1289862 (accessed September 20, 2026).
HarvardWordNet 2010, knuckle down, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/knuckle_down/definitions/1289862>.
MLAWordNet. "knuckle down" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/knuckle_down/definitions/1289862>