flood tide

(noun) the highest point of anything conceived of as growing or developing or unfolding. Synonyms: climax. Examples: "The climax of the artist's career." "In the flood tide of his success."

(noun) the occurrence of incoming water (between a low tide and the following high tide). Synonyms: flood, rising tide. Example: "A tide in the affairs of men which, taken at the flood, leads on to fortune" -shakespeare."