high tide
noun uk/ˌhaɪ ˈtaɪd/ us/ˌhaɪ ˈtaɪd/
(SEA/RIVER)
[ C or U ] (also high water)（海水或河水的）高潮，满潮
the time when the sea or a river reaches its highest level and comes furthest up the beach or the bank
(SUCCESSFUL POINT)
[ S ] UK顶峰，巅峰，全盛时期
Something's high tide is its most successful point.
The signing of the peace treaty was the high tide of her presidency. 那项合约的签署是她任总统期间的最大成就。