high-water mark

Use High-water mark in a sentence

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Idioms & Phrases

high-water mark

The peak of something, especially an achievement. For example, This composition is the high-water mark of his entire output. This expression alludes to the highest mark left on shore by the tide. [Mid-1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Water-level data from sensors at selected locations were compared to
  corresponding high-water mark elevations.
Its publication was the high-water mark of the idealistic tide.
Yet this could be a high-water mark for the euro-area economy.
Yet that case was something of a high-water mark for the commission.
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