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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a scrap or morsel of food left at a meal. |
| knuckle down | |
| —vb | |
| informal (intr, adverb) to apply oneself diligently: to knuckle down to some work | |
knuckle down (to (sth)) definition
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knuckle down
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.