Definition of high tide noun from the Oxford Advanced American Dictionary

     

    high tide

     noun
    noun
     
    [uncountable, countable]
     
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  1. 1the time when the ocean has risen to its highest level; the ocean at this time You can't walk along this beach at high tide.
  2. 2(figurative) the high tide of Victorian prosperity (= the time when something is most popular or successful) compare flood tide, high water opposite low tide
See the Oxford Advanced Learner's Dictionary entry: high tide