Etymologically
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watershed

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Pronunciation

  • /ˈwɔtɚʃɛd/[1]
  • UK: /ˈwɔːtəʃɛd/[1]

Etymology

It is formed from English water + shed,[2][3][4][5] with shed in the sense of a ridge of high ground parting two valleys.[3][6] It was probably modelled on German Wasserscheide (“water parting”),[2][7][8][6][3] which is recorded from the 14th century[2] and is formed from Wasser (“water”) and Scheide (“divide, parting”).[7] Klein and Wiktionary call it a loan translation of the German word.[9][1] The OED compares Dutch waterscheiding (1554).[2] In this sense shed goes back to Old English scēad (“separation”), from the source of the verb shed.[2][3]

Earliest recorded meaning

The line dividing the waters that flow into different rivers or river basins, a narrow ridge between two drainage areas: 1764, in J. Burton's Present State of Navigation on the Thames.[2] Etymonline and Merriam-Webster date the word to 1803,[3][8] Dictionary.com to 1795–1805.[5]

Semantic evolution

From the dividing ridge the word passed to the slope down which the water runs and to the whole gathering ground of a river system (1839), a use now chiefly North American.[2][3] The figurative sense of a turning point in history or in a person's life is recorded from 1854 in the OED, but only from 1878 in Etymonline.[2][3] In 1831 the word was also applied to a structure sloped so that water runs off it, a use the OED calls now rather rare,[2][8] and in 1962 British broadcasters began to use the watershed for the evening hour after which programmes unsuitable for children may be shown.[2] Etymonline thinks that shed alone, as a ridge between valleys, was probably shortened from watershed.[3]

Timeline

  • 1764 – the line separating waters that flow into different rivers.[2]
  • 1803 – first date in Etymonline and Merriam-Webster.[3][8]
  • 1831 – a structure shaped to shed water.[2]
  • 1839 – the gathering ground of a river system.[2]
  • 1854 – figurative, a turning point.[2]
  • 1962 – British television, the time after which adult programmes are shown.[2]

Meanings

Noun

  1. A ridge or line of high ground that divides two drainage areas or river systems.[10][8][2]
  2. (chiefly North American) The area drained by a river or river system; a drainage basin or catchment.[8][2]
  3. A turning point; an event or period that marks an important change: The election proved a watershed for the party.[10][8][2]
  4. (British) The time in the evening after which television programmes unsuitable for children may be broadcast.[2]
  5. A sloping part of a structure that throws off water.[8][2]

Word family

  • milkshed
  • air shed

References

  1. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
  2. ^ a b c d e f g h i j k l m n o p q r s t Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
  3. ^ a b c d e f g h i Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  4. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
  5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
  6. ^ a b Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
  7. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
  8. ^ a b c d e f g h Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  9. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
  10. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins