Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Water, Measurement, Oceanography, Geographylow water markˌlow ˈwater ˌmark noun [countable] TTWTMa mark showing the lowest level reached by a river or other area of water → high water markExamples from the Corpuslow water mark• Below low water mark, predation by lobsters may be significant. ldoceonline.com
