tidemark

noun tide·mark \ ˈtīd-ˌmärk \

Definition of tidemark

1 a : 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

First Known Use of tidemark

1799

in the meaning defined at sense 1a

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TIDEMARK Defined for English Language Learners

tidemark

Definition of tidemark for English Language Learners

  • : 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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