clamp

American  

[klamp] / klæmp /

noun

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 called clamp 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. Nautical.

   1. a horizontal timber in a wooden hull, secured to ribs to support deck beams and to provide longitudinal strength.

   2. mast clamp.

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verb (used with object)

1. to fasten with or fix in a clamp.

   Synonyms:

   secure, clench, clinch

verb phrase

1. clamp down on to impose or increase controls on.

2. clamp down to become more strict.

   There were too many tax loopholes, so the government clamped down.

clamp ¹ British  

/ klæmp /

noun

1. a mechanical device with movable jaws with which an object can be secured to a bench or with which two objects may be secured together

2. See also wheel clamp

3. a means by which a fixed joint may be strengthened

4. nautical a horizontal beam fastened to the ribs for supporting the deck beams in a wooden vessel

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verb

1. to fix or fasten with or as if with a clamp

2. to immobilize (a car) by means of a wheel clamp

3. to inflict or impose forcefully

   they clamped a curfew on the town

clamp ² British  

/ klæmp /

noun

1. a mound formed out of a harvested root crop, covered with straw and earth to protect it from winter weather

2. a pile of bricks ready for processing in a furnace

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verb

1. (tr) to enclose (a harvested root crop) in a mound

Other Word Forms

• unclamped adjective

Etymology

Origin of clamp

1350–1400; Middle English (noun) < Middle Dutch clampe clamp, cleat; cognate with Middle Low German klampe

Explanation

A clamp is a tool that's used to secure two things tightly together. When you repair a chair, it's best to use a clamp to hold the glued pieces together firmly. Carpenters, woodworkers, and plumbers all use clamps when they want to hold things together while they wait for glue to dry or need their hands free. When you use this kind of device, you can also say you clamp something: "Clamp that board down for me before I turn the saw on." Clamp most likely shares a Germanic root with the word clam — *klam-, "to press together."

Example Sentences

"Most of the experiments were conducted using the patch clamp method," explains Christian Grimm, an expert in techniques that measure electrical activity in lysosomal membranes.

From Science Daily • Mar. 26, 2026

And the current deal also comes with notable concessions that clamp down on some of Live Nation’s most risible business practices.

From Slate • Mar. 10, 2026

It said the bill would clamp down on what it calls "a covert filming epidemic" and wants the government to force social media platforms to remove such content and permanently ban repeat offenders.

From BBC • Feb. 10, 2026

The seizure of the Grinch signals a more aggressive approach from Western nations to clamp down on the so-called shadow fleet.

From The Wall Street Journal • Jan. 23, 2026

I clamp my teeth together to keep anything else dumb from escaping my mouth.

From "Rules" by Cynthia Lord

Related Words

• clench
• impose