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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 place

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.
(Definition of high water mark from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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