| gib [gib] ENGINEERING A removable plate designed to hold other parts in place or act as a bearing or wear surface. MINING ENGINEERING 1. A temporary support at the face to prevent coal from falling before the cut is complete, either by hand or by machine. 2. A prop put in the holing of a seam while being undercut. 3. A piece of metal often used in the same hole with a wedge-shaped key for holding pieces together. |