Definition of high-water mark noun from the Oxford Advanced Learner's Dictionary

 

high-water mark

 noun
noun
BrE
 
; NAmE
 
Travelling by boat or ship
 
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a line or mark showing the highest point that the sea or floodwater has reached We pulled the boat up the beach above the high-water mark. (figurative) the high-water mark of Parisian fashion (= the most successful time) compare low-water mark See related entries: Travelling by boat or ship
See the Oxford Advanced American Dictionary entry: high-water mark