high–water mark

noun

: the time when something is most active, successful, etc.

: the highest level that water from a river, ocean, etc., reaches especially during a flood

Full Definition of HIGH-WATER MARK

: highest point : peak

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Synonyms: acme, apex, apogee, capstone, climax, crescendo, crest, crown, culmination, head, high noon, high tide, high-water mark, meridian, ne plus ultra, noon, noontime, peak, pinnacle, sum, summit, tip-top, top, zenith

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