high-water line
noun
variants:
or high-water mark
Definition of high-water line
1a
: the line of the shore of the sea or of a lake or river to which the waters usually reach at high water:
(1)
: the line that marks the limit of the rise of the medium tides of the sea between the spring and neap tides
(2)
: the line that marks the limit of the soil so affected by the water of a lake or river as to have a nature and vegetation distinct from that of the banks
b
: a mark showing the highest level reached by a body of water
2
: the highest point : acme
the high-water mark of a girl's social career— Hamilton Basso
Keep scrolling for more