GIB

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gib

[gib]
(engineering)
A removable plate designed to hold other parts in place or act as a bearing or wear surface.
(mining engineering)
A temporary support at the face to prevent coal from falling before the cut is complete, either by hand or by machine.
A prop put in the holing of a seam while being undercut.
A piece of metal often used in the same hole with a wedge-shaped key for holding pieces together.

gib

1. A steel strap used to clasp two members together.
2. Same as gib or jib door.

bear

A backseat pilot or navigator in a two-seat tandem aircraft. Also called GIB, or guy in back.