verb (used with object), knuck·led, knuck·ling.
- to apply oneself vigorously and earnestly; become serious: Just knuckle down for an hour or so and finish the work.
- Also knuckle under. to submit; yield.
Origin of knuckle
Related formsknuck·ly, adjective
British Dictionary definitions for knuckle down (1 of 2)
British Dictionary definitions for knuckle down (2 of 2)
Derived Formsknuckly, adjective
Word Origin for knuckle
Medicine definitions for knuckle down
Idioms and Phrases with knuckle down (1 of 2)
Apply oneself seriously to some task or goal, as in The professor insisted that we knuckle down and get our papers in by Friday. Both this term and the rhyming synonym buckle down date from the 1860s, but the precise allusion in either is unclear.
See knuckle under.
Idioms and Phrases with knuckle down (2 of 2)
In addition to the idioms beginning with knuckle
- knuckle down
- knuckle under
- rap someone's knuckles