tidemark
noun [ C ] uk/ˈtaɪd.mɑːk/ us/ˈtaɪd.mɑːrk/
(also high water mark)潮痕
a line of waste left on a beach that marks the highest point the sea reaches
UK（脏水在澡盆里或水池周边留下的）垢痕
a dirty mark around a bath or sink, left by the water
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