from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The prominence of the dorsal aspect of a joint of a finger, especially of one of the joints connecting the fingers to the hand.
- n. A rounded protuberance formed by the bones in a joint.
- n. A cut of meat centering on the carpal or tarsal joint, as of a pig.
- n. The part of a hinge through which the pin passes.
- n. A sharp angle formed by the meeting of two surfaces, especially two ship's timbers.
- n. Brass knuckles.
- transitive v. To press, rub, or hit with the knuckles.
- transitive v. To shoot (a marble) with the thumb over the bent forefinger.
- knuckle down To apply oneself earnestly to a task.
- knuckle under To yield to pressure; give in.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the joints between the phalanges of the fingers.
- n. A mechanical joint.
- n. A cut of meat.
- n. The curved part of the cushion at the entrance to the pockets on a cue sports table.
- v. To apply pressure, or rub or massage with one's knuckles.
from the GNU version of the Collaborative International Dictionary of English
- n. The joint of a finger, particularly when made prominent by the closing of the fingers.
- n. The kneejoint, or middle joint, of either leg of a quadruped, especially of a calf; -- formerly used of the kneejoint of a human being.
- n. The joint of a plant.
- n. The joining parts of a hinge through which the pin or rivet passes; a knuckle joint.
- n. A convex portion of a vessel's figure where a sudden change of shape occurs, as in a canal boat, where a nearly vertical side joins a nearly flat bottom.
- n. A contrivance, usually of brass or iron, and furnished with points, worn to protect the hand, to add force to a blow, and to disfigure the person struck; -- called also knuckle duster, knuckles or brass knuckles.
- intransitive v. To yield; to submit; -- used with down, to, or under.
- transitive v. To beat with the knuckles; to pummel.
from The Century Dictionary and Cyclopedia
- n. The joint of a finger, especially that between the metacarpal bone and the first phalanx.
- n. The knee or knee-joint.
- n. A joint, especially of veal, consisting of the part of the leg called the knee. It is the part of the animal which corresponds to the hock of a horse, or the human heel, together with more or less of the leg above this joint.
- n. The joint of a plant; a node.
- n. A joint of cylindrical form, with a pin as axis, as that by which the straps of a hinge are fastened together.
- n. In ship-building, an acute angle on some of the timbers.
- n. plural Pieces of metal, usually brass (hence specifically known as brass knuckles), worn by lawless persons over the knuckles to protect them in striking a blow, and also to make a blow more effective. See knuckle-duster.
- To touch or strike with the knuckle; pommel.
- To bend the knuckles; hold the knuckles (that is, the hand) close to the ground, in playing marbles: usually with down.
- To apply one's self earnestly, as to a task; engage vigorously, as in work.
- To submit, as in a contest; give up; yield.
- n. A sharply bent loop, as of intestine, especially when imprisoned, as in a hernia.
- n. In mech., the swinging leaf or hook used for the coupling device in certain automatic car-couplings, particularly in the Janney or M. C. B. (master car-builders') type. A hole is usually provided in the knuckle so that the common link-coupling may be used with it.
- To apply one's self earnestly.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a joint of a finger when the fist is closed
- v. press or rub with the knuckles
- v. shoot a marble while keeping one's knuckles on the ground
Middle English knokel.(American Heritage® Dictionary of the English Language, Fourth Edition)
From the diminutive of a word for bone, found in German Knochen (Wiktionary)