Definition of high-water mark noun from the Oxford Advanced American Dictionary

     

    high-water mark

     noun
    noun
     
     
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  1. 1a line or mark showing the highest point that the ocean or floodwater has reached We pulled the boat up the beach above the high-water mark.
  2. 2(figurative) the high-water mark of Parisian fashion (= the most successful time) compare low-water mark
See the Oxford Advanced Learner's Dictionary entry: high-water mark