Dictionary

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

First Known Use of HIGH-WATER MARK

1691

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April 28, 2015
portmanteau Hear it
a word formed by the blending of words
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