A device (used by carpenters) that holds things firmly together.
1. A device designed to bind or constrict or to press two or more parts together so as to hold them firmly
2. Any of various instruments or appliances having parts brought together for holding or compressing something

A thin wedge of material (wood or metal or stone) for driving into crevices.
A thin often tapered piece of material (as wood, metal, or stone) used to fill in space between things (as for support, leveling, or adjustment of fit)