Etymologically
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clamp

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Pronunciation

Etymology

It is inherited from Middle English clamp,[2][3] probably borrowed from Middle Dutch clampe (“clamp, cleat”),[4][5][6][3][7] modern Dutch klamp.[4][5] The OED, the Shorter Oxford and Hoad leave open whether it came from Dutch or Low German,[8][9][10] and the OED adds that it might be a native word that happens not to be recorded in Old English.[8] The Germanic word is Proto-Germanic *klampō,[11] a by-form of the stem of clam according to the OED and Hoad.[8][10] It is cognate with Middle Low German klampe (“clasp, hook”) and Old High German klampfer (“clip, clamp”),[4][5] and related to Old English clamm (“bond, fetter”).[4][5][12] Merriam-Webster also compares Old Norse kleppr (“lump”).[3] Klein traces the group to Proto-Indo-European *glem- (“to compress, squeeze”), also the source of Latin glomus (“ball”);[12] Etymonline says perhaps.[4] The noun took the place of the earlier clam, a clamp or brace, from Old English.[4] The verb is from the noun,[8][4][5] like klampen.[8]

Earliest recorded meaning

A brace or band of metal used for fastening: first in the compound clampclute, apparently an iron piece used as a brace, in a manor document of 1304,[2][5] then as clampes in an Exchequer account of 1402.[2][5] The OED's first quotation is from before 1400–50, in the Wars of Alexander,[8] and Etymonline dates the noun to about 1300.[4]

Semantic evolution

In Middle English a clamp was a clamp or brace of iron.[2][8] From the 17th century the word was used of tools with two sides that are screwed together to grip or press something (1688),[8] and in shipbuilding of the thick planks supporting the ends of the deck beams (1626).[8][13] The verb, to make fast with a clamp, is recorded from 1677 in Barnhart and 1678 in the OED, in Moxon's Mechanick Exercises;[5][8] Etymonline puts it in the 1670s and Merriam-Webster in 1683.[4][3] It came to mean to seize or press firmly (1904),[8] and clamp down, to take strong measures against something, appears in 1924.[8] In American slang clamp meant to arrest someone, from 1834.[14] In British English the verb also means to fix a wheel clamp to a car.[13] In Scotland clamp could mean to patch clumsily.[8][15]

Timeline

  • 1304 – in the compound clampclute.[2][5]
  • 1402 – clampes, clamps or braces.[2][5]
  • 1626 – nautical, a plank supporting the deck beams.[8]
  • 1677 – verb, to fasten with a clamp.[5]
  • 1688 – a tool with two parts screwed together to grip something.[8]
  • 1834 – US slang, to arrest.[14]
  • 1904 – to seize or press firmly.[8]
  • 1924 – clamp down, to take strong measures.[8]

Meanings

Noun

  1. A device with movable jaws or parts that are brought together, as by a screw, to hold an object firmly or to press two parts together.[13][3][8]
  2. A brace, band or clasp used to strengthen or fasten things together.[3][8][13]
  3. A wheel clamp.[13]
  4. (nautical) A thick plank on a ship's side supporting the ends of the deck beams.[13][8]

Verb

  1. To fasten or hold with a clamp: Clamp the two planks together until the glue sets.[13][3][8]
  2. To grip or hold tightly: She held the pencil clamped between her teeth.[3][8]
  3. To impose something forcefully, often with on: The army clamped a curfew on the city.[13][3]
  4. (British) To fix a wheel clamp to an illegally parked car.[13]
  5. clamp down: to take strict measures to stop or control something, usually with on.[8][13]

Word family

  • C-clamp
  • clamper
  • unclamp
  • clamp down

References

  1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f Kurath, Hans; Kuhn, Sherman M.; Lewis, Robert E., eds. (1952–2001), Middle English Dictionary, Ann Arbor: University of Michigan Press; online edition ed. Frances McSparran et al. (2000–2018)
  3. ^ a b c d e f g h i Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  4. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  5. ^ a b c d e f g h i j k Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  6. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  7. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  8. ^ a b c d e f g h i j k l m n o p q r s t u v w Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  9. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  10. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  11. ^ Orel, Vladimir (2003), A Handbook of Germanic Etymology, Leiden / Boston: Brill
  12. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  13. ^ a b c d e f g h i j Collins English Dictionary (2023), Glasgow: HarperCollins
  14. ^ a b Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com
  15. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)