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| high-wa·ter mark (plural high-wa·ter marks) |
noun |
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1. highest water level: the highest level reached by any natural stretch of water, especially by the sea at high tide, but also by inland water such as a river during a flood
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2. mark showing highest level: a mark drawn to indicate the highest level reached by any natural stretch of water
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3. peak of something: a high point in an enterprise
 Winning the book award was the high-water mark in her career.
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