Etymologically
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underwater

Etymology and origin of the English word underwater

History Permalink
Confidence
Established
Formation
Compound
First attested
1627

Pronunciation

  • IPA: UK /ˌʌn.dəˈwɔː.tə/, US /ˌʌn.dɚˈwɑː.t̬ɚ/[1]

Etymology

It is formed from under and water, from the phrase under water, submerged, attested by the 1590s.[2][3]

Earliest recorded meaning

Placed or carried on beneath the surface of water: 1627 in the OED and Merriam-Webster, the 1620s in Etymonline.[4][3][2]

Semantic evolution

A noun underwater was water below the ground (1637) or water entering a ship from beneath (1645).[4] Of ships, below the waterline, it is from 1882.[4] Of mortgages on which more is owed than the property is worth, it is from 2008.[2]

Timeline

  • 1590s – under water, submerged.[2]
  • 1627 – underwater.[4][3]
  • 1882 – below the waterline.[4]
  • 2008 – of mortgages.[2]

Modern meaning

Adjective

  1. Existing, happening or used below the surface of water: underwater exploration.
  2. (nautical) Below the waterline of a vessel.
  3. (finance) Of a mortgage or asset, worth less than is owed or was paid.

Adverb

  1. Beneath the surface of the water.

References

  1. ^ Jones, Daniel (2011), Cambridge English Pronouncing Dictionary, 18th ed., ed. Peter Roach, Jane Setter and John Esling, Cambridge: Cambridge University Press
  2. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  3. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  4. ^ a b c d e Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press
Cite this entry

“Underwater.” Etymologically, 17 Oct. 2026, etymologically.com/en/underwater. Accessed 17 Oct. 2026.

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