noun
EXAMPLES FROM CORPUS
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But it was a misreading to suppose that the vote then marked the high water mark on the issue.
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I found what I took to be high water mark with my feet rather than my eyes.
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It would provide the maximum area of water within the engineering constraints and would be broadly equivalent to mean high water mark .
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This was the high water mark of Elf culture when most of their greatest works of art were created.