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watershed noun

  /ˈwɔtɚʃɛd/ , /ˈwɔːtəʃɛd/
  • (hydrology, UK, Ireland, Australia, New Zealand) The topographical boundary dividing two adjacent catchment basins, such as a ridge or a crest.
 ligne de partage des eaux
  • (figurative) A critical point marking a change in course or development.
 tournant décisif
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