- the lowest point reached by a low tide.
- something indicating the bottom of a decline.
- the lowest or least admirable level: the low-water mark of political chicanery.
Origin of low-water mark
First recorded in 1520–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for low-water mark
- the level reached by seawater at low tide or by other stretches of water at their lowest level
- the lowest point or level; nadir