Definitions from Wiktionary ( )

▸ noun:  Any of the joints between the bones of the fingers.
▸ noun:  (by extension) A mechanical joint.
▸ noun:  (sports, billiards, snooker, pool) The curved part of the cushion at the entrance to the pockets on a cue sports table.
▸ noun:  The kneejoint of a quadruped, especially of a calf; formerly, the kneejoint of a human being.
▸ noun:  A cut of meat of various kinds.
▸ noun:  (obsolete) The joint of a plant.
▸ noun:  (shipbuilding) 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.
▸ noun:  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; a knuckle duster.
▸ noun:  (skiing, snowboarding) The rounded point where a flat changes to a slope on a piste.
▸ verb:  (transitive) To apply pressure, or rub or massage with one's knuckles (sense 1).
▸ verb:  (transitive, slang) To strike or punch.
▸ verb:  (intransitive) To bend the fingers.
▸ verb:  (intransitive) To touch one's forehead as a mark of respect.
▸ verb:  (intransitive, figurative) To yield.
▸ verb:  (snowboarding, skiing) To land on the knuckle (sense 9) of a curve of a slope, after a jump off a ramp that precedes the slope.

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