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English definition of “tidemark”

tidemark

noun [C]     /ˈtaɪd.mɑːk/ US  /-mɑːrk/
(also high water mark) a line of waste left on a beach that marks the highest point the sea reaches Floods, tides and currents UK a dirty mark around a bath or sink , left by the water Dirt and untidiness
(Definition of tidemark noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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