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Clamp (tool) For other uses, see Clamp. A clamp is a fastening device used to hold or secure objects tightly together to prevent movement or separation through the application of inward pressure.
clinch. 1  bench clamp - a clamp used to hold work in place on a workbench. 2  C-clamp - a clamp in the shape of the letter C. 3  cramp - a clamp for holding pieces of wood together while they are glued.  holding device - a device for holding 1  something. pipe clamp, pipe vise - a clamp for holding pipe that is to be cut or threaded.