tide·mark
| \ ˈtīd-ˌmärk
\
\
Definition of tidemark
1a
: a high-water or sometimes low-water mark left by tidal water or a flood
b
: a mark placed to indicate this point
2
: the point to which something has attained or below which it has receded
the tidemark of tolerance has risen — New Republic
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“Tidemark.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/tidemark. Accessed 19 May. 2022.
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Time Traveler for tidemark
The first known use of tidemark was in 1799
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