Low water mark

low-water mark

noun
1.
the lowest point reached by a low tide.
2.
something indicating the bottom of a decline.
3.
the lowest or least admirable level: the low-water mark of political chicanery.

Origin:
1520–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
low-water mark
 
n
1.  the level reached by seawater at low tide or by other stretches of water at their lowest level
2.  the lowest point or level; nadir

Collins English Dictionary - Complete & Unabridged 10th Edition
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