knuckle

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Related to knuckled under: knuckled 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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Knuckle

The part of a hinge containing the holes through which the pin passes.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

knuckle

[′nək·əl]
(mining engineering)
The place on an incline where there is a sudden change in grade.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

knuckle

One of the cylindrically projecting parts of a hinge through which the pin passes.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.