high water mark

high-water mark

[hahy-waw-ter, -wot-er]
noun
1.
a mark showing the highest level reached by a body of water.
2.
the highest point of anything; acme: Her speech was the high-water mark of the conference.

Origin:
1545–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
high-water mark
 
n
1.  a.  the level reached by sea water at high tide or by other stretches of water in flood
 b.  the mark indicating this level
2.  the highest point

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