|an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.|
|a fool or simpleton; ninny.|
|1.||a joint of a finger, esp that connecting a finger to the hand|
|2.||a joint of veal, pork, etc, consisting of the part of the leg below the knee joint, often used in making stews or stock|
|3.||the cylindrical portion of a hinge through which the pin passes|
|4.||an angle joint between two members of a structure|
|5.||informal near the knuckle approaching indecency|
|6.||(tr) to rub or press with the knuckles|
|7.||(intr) to keep the knuckles on the ground while shooting a marble|
|[C14: related to Middle High German knöchel, Middle Low German knoke bone, Dutch knok]|
|informal (intr, adverb) to apply oneself diligently: to knuckle down to some work|
knuckle knuck·le (nŭk'əl)
The prominence of the dorsal aspect of a joint of a finger, especially of one of the joints that connect the fingers to the hand.
A rounded protuberance formed by the bones in a joint.
A kink or loop of intestine, as in a hernia.
knuckle down (to (sth)) definition
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.