Meaning of “low-water mark” in the English Dictionary

british dictionary

"low-water mark" in British English

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low-water marknoun [ C usually singular ]

uk /ˌləʊˈwɔː.tə ˌmɑːk/ us /ˌloʊˈwɑː.t̬ɚ ˌmɑːrk/ also low-water line

the lowest point on a beach that is reached by the sea at low tide

(Definition of “low-water mark” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)