Pronunciation: (klamp),[key] —n. 1. a device, usually of some rigid material, for strengthening or supporting objects or fastening them together.
2. an appliance with opposite sides or parts that may be adjusted or brought closer together to hold or compress something.
3. one of a pair of movable pieces, made of lead or other soft material, for covering the jaws of a vise and enabling it to grasp without bruising.
4. Also calledclamp' rail".Carpentry.a rail having a groove or a number of mortises for receiving the ends of a number of boards to bind them into a flat piece, as a drawing board or door.
5. Naut. a. a horizontal timber in a wooden hull, secured to ribs to support deck beams and to provide longitudinal strength.
b. See mast clamp.
—v.t. 1. to fasten with or fix in a clamp.
2. clamp down,to become more strict: There were too many tax loopholes, so the government clamped down. 3. clamp down on, to impose or increase controls on.