- the point that something or someone has reached, receded below, or risen above: He has reached the tidemark of his prosperity.
- a mark left by the highest or lowest point of a tide.
- a mark made to indicate the highest or lowest point of a tide.
- a mark left by the highest or lowest point of a tide
- a marker indicating the highest or lowest point reached by a tide
- a mark showing a level reached by a liquid
- a dirty mark on the skin, indicating the extent to which someone has washed
