Longman Dictionary of Contemporary English homepage

high water mark

 noun
     
Related topics: Oceanography, Geography, Water
high water mark [singular]
1SCTTW the mark that shows the highest level that the sea or a river reaches
2 the time when someone or something is most successful
high water mark of
the high water mark of Herrera's presidency
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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