01 n. a mark on a shore line indicating the normal level of the water at high tide, caused by the action of the flowing water; sometimes also use…
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1.
a mark on a shore line indicating the normal level of the water at high tide, caused by the action of the flowing water; sometimes also used for the mark left at the point of the normal low tide; -- called also high water mark. Also: high water mark
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2.
the maximum level which some activity has reached and from which it has declined; -- called also high water mark.[fig.] Also: high water mark