Etymologically
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underside

This is the current revision of this entry, as edited by bogdan on 1 November 2026 at 02:59. This address is a permanent link to this version.
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Pronunciation

  • UK: /ˈʌndəˌsaɪd/[1]
  • US: /ˈʌndɚˌsaɪd/[1]

Etymology

It is formed from English under- + side,[2][3] or, in the OED's second analysis, from the adjective under and side.[4][5][6] Similar formations are Dutch onderzijde, Danish underside and German Unterseite.[4][5]

Earliest recorded meaning

The lower side or surface of something: Merriam-Webster dates this sense to 1660.[6] The OED's first record is from 1680, in Joseph Moxon's Mechanick Exercises,[4] and Etymonline also dates the word to the 1680s;[5] Dictionary.com gives 1670–80.[3]

Semantic evolution

Besides the literal lower surface, the word came to mean the side of something usually hidden from view, and so its worse or less respectable side: Merriam-Webster quotes R. M. Kain on the underside of civilization showing itself in slums and brothels.[6] The Shorter Oxford quotes George Eliot's figurative use, comfort as the underside of all pleasure.[2] In embroidery, underside couching is a technique named after it.[2]

Timeline

  • 1660 – the lower side or surface.[6] The OED's first record is from 1680, in Moxon's Mechanick Exercises.[4][5]

Meanings

Noun

  1. The lower side or surface of something; the bottom: the underside of a bridge.[7][6][4]
  2. The side of something that is usually hidden from view, especially its less pleasant side: the underside of city life.[6][2]

References

  1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  3. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  4. ^ a b c d e Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  5. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  6. ^ a b c d e f Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  7. ^ Collins English Dictionary (2023), Glasgow: HarperCollins