knuckle

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Related to knuckle under: knuckling down

knuckle

1. a joint of a finger, esp that connecting a finger to the hand
2. the cylindrical portion of a hinge through which the pin passes
3. an angle joint between two members of a structure

Knuckle

The part of a hinge containing the holes through which the pin passes.

knuckle

[′nək·əl]
(mining engineering)
The place on an incline where there is a sudden change in grade.

knuckle

One of the cylindrically projecting parts of a hinge through which the pin passes.