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English definition of “high water mark”

high water mark

noun [C usually singular] uk   us  

high water mark noun [C usually singular] (SEA/RIVER)

a mark that shows the highest level that the sea or river reaches at a particular placeFloods, tides and currents

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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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