tidemark
noun/ˈtaɪdmɑːk/
/ˈtaɪdmɑːrk/
- a line that is made by the sea on a beach at the highest point that the sea reachesTopics Transport by waterc2, Geographyc2
- (British English, informal) a line that is left around the inside of a bath by dirty water
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tidemark