Definition of “high water mark” - English Dictionary

“high water mark” in British English

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high water marknoun [ C usually singular ]

uk /ˌhaɪ ˈwɔː.tə ˌmɑːk/ us /ˌhaɪ ˈwɑː.t̬ɚ ˌmɑːrk/

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