knuckle

• To yield
• a joint of a finger when the fist is closed
• press or rub with the knuckles
• shoot a marble while keeping one´s knuckles on the ground
• The joint of a finger, particularly when made prominent by the closing of the fingers
• The kneejoint, or middle joint, of either leg of a quadruped, especially of a calf
• The joint of a plant
• The joining pars of a hinge through which the pin or rivet passes
• 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
• 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
• To beat with the knuckles

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