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tidemark

noun
🔊/ˈtaɪdmɑːk/
🔊/ˈtaɪdmɑːrk/
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  1. a line that is made by the sea on a beach at the highest point that the sea reaches（海滩上的）高潮痕Topics Transport by waterc2, Geographyc2
  2. (British English, informal) a line that is left around the inside of a bath by dirty water（污水在浴缸内侧留下的一圈）垢痕