tidemark
noun
tide·mark
| \ ˈtīd-ˌmärk
\
\
Definition of tidemark
1a
: a high-water or sometimes low-water mark left by tidal water or a flood
b
: a mark placed to indicate this point
2
: the point to which something has attained or below which it has receded
the tidemark of tolerance has risen — New Republic
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More Definitions for tidemark
tidemark
noun
English Language Learners Definition of tidemark
chiefly British
: a mark on the beach that shows how far the water came in toward the shore when the tide was high
British, informal
: a mark left by dirty water in a bathtub
See the full definition for tidemark in the English Language Learners Dictionary