tidemark

noun
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 risenNew Republic

First Known Use of tidemark

1799, in the meaning defined at sense 1a

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The first known use of tidemark was in 1799

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tidemark

noun

English Language Learners Definition of tidemark

: a mark on the beach that shows how far the water came in toward the shore when the tide was high

: a mark left by dirty water in a bathtub

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