ˌhigh ˈtide BrE AmE noun
1 . [uncountable and countable] the point or time at which the sea reaches its highest level OPP low tide :
High tide is at seven in the morning.
at high tide
The waves became much more powerful at high tide.
2 . [singular] the time when something is at its best or most successful:
the high tide in the party’s fortunes