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low-water mark

noun
🔊/ˌləʊ ˈwɔːtə mɑːk/
🔊/ˌləʊ ˈwɔːtər mɑːrk/
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  1. a line or mark showing the lowest point that the sea reaches at low tide低潮线；低潮水位标记 opposite high-water markTopics Transport by waterc2