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Definition of tidemark
1a : a high-water or sometimes low-water mark left by tidal water or a floodb : 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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First Known Use of tidemark
1799
TIDEMARK Defined for English Language Learners
tidemark
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noun
Definition of tidemark for English Language Learners
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: a mark on the beach that shows how far the water came in toward the shore when the tide was high
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: a mark left by dirty water in a bathtub
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