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English definition of “high water mark”

high water mark

noun [C usually singular] (SUCCESSFUL POINT)   
the most successful point of something: His 1991 election victory was probably the high water mark of his popularity.Higher and lower points of achievementSuccess and achievementsFailures
(Definition of high water mark noun (SUCCESSFUL POINT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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