Tidemark meaning

tīdmärk
A line or mark on a shore indicating the highest or lowest level reached by the tide.
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A trace or indication of past activity.
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A mark indicating the highest point of flood tide or, sometimes, the lowest point of ebb tide.
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A line or mark on a shore indicating the highest or lowest level reached by the tide.
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A line (of seaweed or differently coloured sand etc) on the shore showing the level of high or low tide.
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(by extension) Any mark showing the limit of some past activity.
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(humorous) A line of scum left on a bath tub when the water is drained away.
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