Dictionary

tidemark

noun tide·mark \-ˌmärk\

: a mark on the beach that shows how far the water came in toward the shore when the tide was high

: a mark left by dirty water in a bathtub

Full Definition of TIDEMARK

1
a :  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>

First Known Use of TIDEMARK

1799

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