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Use "water-shed" in a sentence
"President Obama's speech in Cairo was widely lauded as a water-shed event in Arab-US relations for the tone he adopted in reaching out to the Arab world."
"The point of support, thus encountered in the mire at the supreme moment, was the beginning of the other water-shed of the pavement, which had bent but had not given way, and which had curved under the water like"
"Proceeded on a north course, and at seven miles crossed what seemed to be a water-shed, seemingly running to the west of north."