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

 

high water

 noun
noun
BrE
 
; NAmE
 
[uncountable] Travelling by boat or ship
 
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  • the time when the sea or the water in a river has risen to its highest level Fishing is good at high water. compare high tide See related entries: Travelling by boat or ship
  • Idioms
    (come) hell or high water
     
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    despite any difficulties I was determined to go, come hell or high water.
    See the Oxford Advanced American Dictionary entry: high water