high tide
noun /ˌhaɪ ˈtaɪd/
  /ˌhaɪ ˈtaɪd/
 (also high water)
 [uncountable, countable]- the time when the sea has risen to its highest level in a particular place; the sea at this time
- at high tide You can't walk along this beach at high tide.
 - (figurative) the high tide of Victorian prosperity (= the time when something is most popular or successful)
 
Oxford Collocations DictionaryHigh tide is used before these nouns:- mark