1. a joint of a finger, especially one of the articulations of a metacarpal with a phalanx.
2. the rounded prominence of such a joint when the finger is bent.
3. a joint of meat, consisting of the parts about the carpal or tarsal joint of a quadruped.
4. an angle or protrusion at the intersection of two members or surfaces, as in the timbers of a ship or in a roof.
5. brass knuckles.
6. a cylindrical projecting part on a hinge, through which an axis or pin passes; the joint of a hing
"criminals can be knuckle down to anyones."
"criminals can be knuckle."
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