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tidemark

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tidemark/ˈtaɪdˌmɑɚk/noun
pluraltidemarks
tidemark
/ˈtaɪdˌmɑɚk/
noun
pluraltidemarks
Learner's definition of TIDEMARK  
[count]
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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