English Reference

Word

clamp

US/ˈkɫæmp/

UK/klˈæmp/

Definitions

01a tool for holding

B2 · Upper Intermediate Countable noun

n. a tool that you use to hold two things together very tightly while you work on them.

n. a mechanical device used to strengthen or hold objects together by applying inward pressure.

“He used a metal clamp to hold the pieces of wood together while the glue dried.”

“The carpenter tightened the G-clamp until the two joints were perfectly aligned and immobile for the duration of the curing process.”

Synonyms

02medical tool

C1 · Advanced Countable noun Medicine Technical

n. a medical tool used by doctors to stop blood from flowing through a vessel during an operation.

n. a surgical instrument designed to compress a structure, such as a blood vessel or a duct, to prevent leakage or flow.

“The surgeon placed a clamp on the artery to stop the bleeding.”

“The surgical team monitored the pressure carefully after the vascular clamp was applied to ensure no damage occurred to the vessel walls.”

Synonyms

hemostat

03wheel lock

B2 · Upper Intermediate Countable noun British English

n. a metal lock put on a car wheel by the police so the car cannot be driven away.

n. a device attached to the wheel of a vehicle to prevent it from being driven, typically used for parking enforcement.

“He returned to his car only to find a yellow clamp on the front wheel.”

“The council authorised the use of a wheel clamp after the vehicle had accumulated several unpaid parking fines over the preceding months.”

Synonyms

wheel clampboot

04to fasten or grip

B2 · Upper Intermediate

v. to hold something very tightly or to fix it in place using a tool.

v. to fasten or secure an object in place with a clamp; to grip something with great force.

“She clamped her hands over her ears to block out the loud noise.”

“The machine part must be clamped firmly to the workbench before you begin the drilling process to avoid any dangerous shifts in position.”

Synonyms

Antonyms

05to restrict a value

C1 · Advanced Computing Technical

v. to limit a number so it stays between a certain high and low point.

v. to restrict a numerical value to a specific range, replacing any value outside the range with the nearest boundary value.

“The software will clamp the volume level so it never gets too loud for the speakers.”

“The algorithm is designed to clamp the output signal between zero and one to prevent data overflow during the final processing stage.”

Synonyms

Real-World Examples

“There’s a clamp for the phone next to the screen, and a small hatch below allows access to a USB charging port; it has enough space to store long charging cords.”
Ars Technica 5 Aug 2026
“His gifts show the rise of Reform’s mega-donors, which Labour has been considering clamping down on.”
The Guardian 11 Sept 2026
“Games flowed more in North America, in part because of officials clamping down on the “meat wall” at set pieces.”
The Guardian 11 Sept 2026

Etymology

From Middle Dutch clamp, klampe (“a clamp, hook”), from Proto-Germanic klampō (“clamp, clasp, cramp”), related to Proto-West Germanic klammjan. Cognate with Middle Low German klampe (“hook, clasp”), German Klampfe, Klampe (“clamp, cleat”), Norwegian klamp (“clamp”), Alemannic German Chlempi.

Imitative.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Idioms

Domains

AgricultureElectronicsMedicine

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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English Reference