tide·​mark | \ ˈtīd-ˌmärk How to pronounce tidemark (audio) \

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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Cite this Entry

“Tidemark.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/tidemark. Accessed 7 December 2019.

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How to pronounce tidemark (audio)

English Language Learners Definition of tidemark

chiefly British : a mark on the beach that shows how far the water came in toward the shore when the tide was high
British, informal : a mark left by dirty water in a bathtub

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